MeterMatch allows you to mix and match different gauges and senders, or to make gauges more accurate. It can be used with many gauges that have resistive senders - such as fuel, oil pressure and temperature gauges. In addition, it allows you to have low and/or high set-points that will trigger a bright, blinking, LED indicator to alert if the gauge exceeds normal values.
It is housed in a small (2.4" x 1.85" x .93") enclosure that can be located behind the dashboard near the gauge. Wire connections are made via a screw-terminal strip inside.
Theory of Operation
MeterMatch is wired between your sender (sensor) and your gauge. It reads the resistance of the sender, then based on your user-defined internal calibration values, it sends a signal to drive the gauge to the desired reading. It treats the input and output entirely separately, so it doesn't care if the input to the gauge is scaled differently than the sender, or even if the sender signal has a reversed sender signal than the gauge - it can correct for that.
To calibrate MeterMatch, you first set the sender to a known value. For example, fill your fuel tank. Set the MeterMatch to program mode, then with the up and down buttons, make your gauge read what you want for that sender value. When you are satisfied with the reading, press the "save" button, and the value is remembered in the MeterMatch. Do the same process with the sender reading a value near the other end of its range, and you are done. MeterMatch interpolates from these values to make the gauge read proportionately at values above, below, and between the calibration values. It also has cardinal-point values stored inside that you can use if you know the resistance of your sender.
The basic process of having the gauge read properly from calibration points near each end of the range is fine for most applications, but you can be more sophisticated if you wish. For example, what if your fuel tank is large at the bottom, and small at the top? In this case, it won't read properly throughout the range. MeterMatch provides two additional calibration points between the endpoints. So, in this case, you could have an additional calibration point where the tank changes size. Another use for these points would be if your tank is cylindrical (like a truck fuel tank) so the gauge is inaccurate at both sides of center. Here, you can add additional calibration points (for example at 30% and 70%) and the accuracy is drastically improved. Or - you can simply use the additional cal-points to provide improved accuracy at mid-scale points.
The calibration values are stored in non-volatile memory inside MeterMatch, so they remain, even when no power is connected to the unit.
For complete details about installation, use, limited warranty, and return policy, refer to the MeterMatch Instruction Manual. While MeterMatch 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, MeterMatch comes with a money back guarantee.
While MeterMatch is typically used when mixing and matching senders and gauges, it can be used for other things as well.
Here's an article by a good engineer from Accutach, Mark Olson, about how he used MeterMatch modules to make the temperature and oil pressure gauges in a late model Mustang much more usable and accurate...
Or read it here: 1978-1998 Mustang gauge upgrade with MeterMatch
A MeterMatch was also used in another unique application. Early British Morris Minors only have two gauges: a speedometer and a fuel gauge. In this installation, the user installed a toggle switch under the dash, along with a MeterMatch connected to a temperature sensor on the engine, to allow the switch to toggle the fuel gauge to serve as either a fuel gauge or a temperature gauge. Other than the switch under the dash, the car still looks perfectly stock, but has more useful instrumentation now.
MeterMatch is shipped via priority mail which normally takes two-three days for delivery from time of shipment for domestic orders. Shipments are typically made within one working day from time of order.
MeterMatch - Price: $44.95 + $6.50 shipping (priority mail)
Additional Shipping to Canada $19.00
Additional Shipping to Australia/UK/Europe $29.00
MeterMatch is designed and made in the USA. Sales within Washington State are subject to sales tax.
MeterMatch Wiring Kit...
The MeterMatch MM-01 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.
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.
MeterMatch Wiring Kit Model WK-01 $8.50
MeterMatch for Early Ford and Mopar Gauges
Ford and Chrysler gauges of the 60's and early 70's have an electro-mechanical voltage regulator to drive the instruments, which typically include the temperature and fuel gauges. To work properly with MeterMatch, these vehicles need a more precisely regulated voltage to the gauge. The MeterMatch-VR combines standard MeterMatch functions with a precise 5v regulator for the gauge. Otherwise, it is similar to the standard MeterMatch, but without provisions for the alarm indicator. Rather than screw terminals, it is shipped with wires installed that have ring terminals where common connections are made to #10 posts, such as for power, ground, and the two gauge connections. The sender wire is unterminated since that would normally be spliced to the wire from your sender, rather than using a ring terminal. For more information, see MeterMatch-VR Instruction Manual and Specifications.
Here's a well-written article by Bob Mannel from Fairlaner Magazine that explains how MeterMatch can be used to correct the fuel gauge in 60's Ford Fairlanes. Many of the late 50's to early 70's Ford products such as Mustangs, Falcons and trucks have similar circuitry. MeterMatch used to correct fuel readings in early Ford products. In the article, he was reviewing a standard MeterMatch in conjunction with a separate voltage regulator, which is now included in the MeterMatch-VR. This combined product requires fewer connections. MeterMatch-VR is shipped pre-calibrated to approximate values, but since there are such wide variations from vehicle to vehicle, you should do final calibration once it is installed.
If you are out of the US, the adders for shipping shown above are also applicable to the MeterMatch-VR.
MeterMatch-VR - Price: $59.95 + $6.50 shipping (priority mail)
Signal IsolationSometimes, the gauge is mounted on a printed circuit board, making it difficult to isolate the gauge which you are powering with the MeterMatch-VR from the power regulator in the dash which is powering the other gauges. In this case, you can use isolation flanged washers, and additional nuts so that the MeterMatch signals do not interfere with the signals on the circuit board. This drawing shows how they can be isolated. The isolation kit provides two stepped nylon isolation washers, along with two additional stainless-steel 10-32 nuts for making the connection. This kit is only available with purchase of a MeterMatch, and does not add any shipping charges since it is shipped with the MeterMatch.
Optional MeterMatch PCB Isolation Kit - Price $2.50
MeterMatch (but not MeterMatch-VR) allows you to set low and high alarm set-points. These are set just like the calibration points, but instead of driving the meter reading, they set a signal to trigger this optional blinking LED which can be mounted near the meter to alert the driver to take a look at the gauge. You can use none, either, or both set-points. The LED has a large 10mm (approx 3/8"), bright lens and installs in a 9/16" hole in panels up to 1/8" thick. It includes approximately 12" of hook-up wires. The Alarm Indicator is only available with MeterMatch purchase, and does not add any additional shipping cost.
Optional LED Alarm Indicator - Price: $6.00