Tach MatchTM

Tachometer Converter: TachMatchTM

TachMatch is a solution for making your tachometer work, when things just don't match up like they did at the factory.

Did you do an engine conversion? Maybe change the type of tachometer drive signal by installing a different ignition? Install an engine with more cylinders? You don't have to change your tachometer or instrument panel - you can install a TachMatch tachometer adapter into your car, truck or boat.

How It Works

How TachMatch Works...

Tach Input:

The TachMatch TM-03 accepts most standard tachometer inputs. If you have a standard coil and points ignition, connect TachMatch to your coil. If you are using an aftermarket system to control the coil, such as an MSD, TachMatch accepts its tachometer output signal. If you have a typical GM HEI ignition, the HEI tachometer output signal drives TachMatch. If you are driving your tach from an ECU, the TachMatch provides an internal pull-up resistor for compatibility.

Cylinder Conversion:

If your tachometer is designed for a different number of cylinders than your engine, The TachMatch TM-03 can change the frequency appropriately to correctly drive your tachometer. By selecting how many cylinders your engine has (1-8), and how many cylinders your tach expects (1-8), a wide variety of ratios are available, anywhere from 1:8 ratio to an 8:1 ratio.

Tach Drive Output:

The TachMatch TM-03 sends the corrected signal to your tachometer. It can drive standard voltage-driven tachs, vintage tachs (such as older Stewart Warner, Radatron or Sun tachs), or if you have a current-driven tach, specify the TachMatch TM-03-I-Drive which also includes a power resistor. If you have a hard-to-drive voltage-driven tach (like the later Z-cars), the TachMatch V-Boost provides a higher amplitude signal.


TachMatch Summary

TachMatch Product Summary

There are several TachMatch Products, all described below in more detail. Here's an overview to help decide which products apply to your application:

  • The standard TachMatch TM-03 is used in most applications. It allows triggering from a coil ignition, HEI, MSD, and ECU tach output signals. It will directly drive most standard voltage-driven tachometers, as well as vintage tachometers, such as early Sun, S-W and Radatron units which are typically identified by only having two terminals on the back, labeled + and -. With vintage tachometers, the TachMatch is installed in place of the original sender module, which is no longer necessary. If you wish to maintain the original look of the interface, the TachMatch can be installed inside an EB-style interface, as shown here, or inside a Red Can interface, as shown here.
  • The TachMatch TM-03 I-Drive is used for applications where the tachometer is current-driven, rather than voltage-driven. This applies to early '70s Datsuns, Smiths and Jaeger gauges marked RVI, and others where there is a loop of wire on the rear of the tachometer. It is the same as the standard TachMatch TM-03, but also includes a power-shunt resistor
  • The TachMatch V-Boost is used for tachometers that require more than 12v to actuate. While most tachometers trigger from a 12v signal, some rely on the higher-voltage generated by the coil's inductive spike. Examples include some Jeeps and Porsche/VW VDO tachometers. We have also seen a number of early Datsun tachometers that need additional voltage to trigger. It is designed to be triggered by ECU, MSD or another TachMatch, but not for triggering directly from the coil. The V-Boost unit does not do cylinder translation.

TachMatch Model Summary

Model Trigger Type Ratios Tachometer Type
  Coil MSD HEI ECU Cylinder-Count Conversion Standard Voltage-Driven Tach Current-Driven Tach Vintage Tach Hi-Volt Drive
TachMatch TM-03 X X X X X X   X  
TachMatch TM-03 I-Drive X X X X X X X X  
TachMatch V-Boost   X   X   X     X

TachMatch is connected via screw terminals on each module. Wire is not provided. An optional Wiring Kit is available if you do not have suitable wire readily available.

TachMatch products are shipped via priority mail. Please see TachMatch purchase information for purchase details and additional postage necessary when shipping out of the US. Please look over the TachMatch FAQ for more information prior to purchase.

For an excellent source for repair and detailed information about Smiths, Jaeger and VDO tachometers, as well as late-model Ford and other instrumentation, visit the Accutach Co. site. Accutach also offers a solution for the 760-series Stewart-Warner vintage tachometers which were originally driven with a "switch" sandwiched between the distributor and distributor cap.

Standard TachMatch

Standard TachMatch

The TachMatch Model TM-03 is designed with computer-controlled internal circuitry housed in a plastic enclosure. A 5-pin terminal strip is used for connection of the wiring (wires not included, but can be purchased below). To help solve any installation problems, it includes diagnostic tools, such as a LED that indicates power and if it is being triggered, and a special test output that can ensure that it is connected properly to your tachometer by providing a 4,000 RPM signal. If you are driving a vintage tachometer, a potentiometer allows you to adjust the output to make your tach read properly. For other types of tachometers (voltage and current-driven) that do not read correctly with the accurate digital signal, you can adjust the output to make a correction.

The TachMatch will trigger from the coil, HEI tach signal, MSD tach signal, or from an ECU. If you are triggering from an ECU, it contains an internal pull-up resistor. It is compatible with Pertronix ignitions except multiple spark units such as the Pertronix Ignitor III.

Here is more information about the TachMatch Model TM-03:

Specifications Warranty Instruction Manual

The standard TachMatch TM-03 drives most analog tachometers.

If you are not in the United States, please click here for information about international shipping.

TachMatch Model TM-03

$79.95 including priority mail shipping to US addresses (see below for international shipping adders).


TachMatch I-Drive for Current-Driven Tachs

Some earlier vehicles (such as the early 70's Datsuns and Smiths/Jaeger tachs labeled as RVI on the face) use a current-driven tachometer instead of a voltage-driven tachometer. These types of tachometers can usually be identified by loops of wire around the connections at the back of the tachometer (see an example here). It takes more current and different wiring to drive these tachometers than typical voltage-driven tachometers.

This unit is the same as the standard TachMatch TM-03, but in addition, it includes an external power resistor to sink the current necessary for current-driven tachs.

See the TachMatch TM-03 instruction manual above for details of installation. If you are installing it in an early Datsun 240Z, you can find wiring information here... .240Z TachMatch Wiring

If you are not in the United States, please click here for information about international shipping.

TachMatch Model TM-03 I-Drive

$89.95 including priority mail shipping to US addresses (see below for international shipping adders).

Voltage Boost

TachMatch Voltage Boost Module

Most tachometers can be driven with a 12v pulse signal, such as that provided by the standard TachMatch and the MSD-6 series. However, some tachometers need a stronger signal that more closely replicates the signal generated by the coil.

The TachMatch V-Boost Module takes a lower level input signal, whether it be ECU output, MSD 6 tach output, or from a standard TachMatch TM-03, and generates a stronger signal to the tachometer, similar in function to the MSD 8920.

Another application is when you are changing from a coil-style ignition to a system that uses a ECU. Often, ECU's, with a 5-volt signal, will not drive tachometers designed to use a 12-volt (or higher) level signal. This unit will convert from the digital-level signal to one which will drive your tachometer, similar to the Auto Meter 9117.

The TachMatch Voltage Boost Module does not do cylinder conversion. If you need that, it needs to be driven from a TachMatch TM-03.

Details of it's connection can be found in the instruction manual below.

Specifications Warranty Instruction Manual

If you are not in the United States, please click here for information about international shipping.

TachMatch V-Boost Module

$59.95 including priority mail shipping to US addresses (see below for international shipping adders).



TachMatch Wiring Kit...

The TachMatch is installed with four external wires connected to an internal terminal strip (see instruction sheet for details). Wire size can range from #14 to #22. If you don't have wiring supplies readily available, the model WK-01 wiring kit consists of four 36"-long wires, one each of red, black, orange and white. Also included are four butt-connectors and two ring terminals. The wire size included in the kit fits well in the enclosure slots.

Wire is high-quality, made in USA, 18-AWG stranded. Terminal style may vary from that shown in picture. This kit is only available with purchase of a TachMatch or MeterMatch, and does not add any shipping charges.

TachMatch/MeterMatch Wiring Kit Model WK-01 $8.50.

6v to 12v Converter...

The TechnoVersions Model DC6DC12 DC:DC converter is used to install a TachMatch or MeterMatch in a 6-volt vehicle. These modules need 12-volts to operate, which this converter provides from a 6-volt input. It can be used in both positive and negative ground installations.
For details, please refer to the Instruction Manual. This is only available with the purchase of a MeterMatch or TachMatch and includes free domestic shipping.

TachMatch/MeterMatch 6v to 12v Converter Model DC6DC12 $19.50.

Shipping outside the USA

Free shipping applies to USA/APO/FPO addresses. For shipping outside the US, please also select one of the following priority mail international options. International shipping is via USPS Priority Mail International which takes about 10-12 days to most destinations.
Additional Shipping to Canada $22.50
Additional Shipping to Australia/NZ/UK/Europe $32.50

TechnoVersions LLC Purchase Information

TechnoVersions LLC Purchase Information

Each TachMatch is designed and made in the USA. TachMatch can only be purchased on-line. Sales tax is collected for sales within Washington State. See above for additional shipping charges for international shipments.

While TachMatch has been designed to accommodate a wide range of applications, everything that you might try to mix and match can't be anticipated. So if you find that it doesn't work in your application, TachMatch comes with a money back guarantee (see warranty for details). You become responsible for loss once delivered to a comnmon carrier by TechnoVersions LLC. See the instruction manual links above for details about the six-month limited warranty provided.