Meter MatchTM


Application Notes

Analog Gauge Converter: MeterMatchTM

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.



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 electronically emulates the sender 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.

Detailed Description

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. Please look over the MeterMatch FAQ for more information prior to purchase.

MeterMatch Installation and Calibration Video

This MeterMatch video describes MeterMatch installation and use. While it contains a lot of detailed information, most of the information you will need for the typical installation and programming (calibration) is included in the first few minutes. If you would like to move around to see particular topics, here are the start times for the various sections: 0:00 Introduction/Overview, 1:51 Wiring, 3:19 Basic Calibration, 6:34 Calibration with known values, 10:46 Alarm LED, 14:45 Voltage Correction, 17:02 Reading Averaging, 18:38 Other Calibration Ideas. Note that all of the information included in the video is also in the instruction manual which may be used for reference to augment the video. The video is also available on YouTube, click here.

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. The MeterMatch MM-02 has been designed to work in conjunction with these electromechanical regulators without repowering the gauge. The MeterMatch MM-02 replaces the earlier MeterMatch-VR unit.

Application Ideas

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...
1978-1998 Mustang gauge upgrade with MeterMatch.

A MeterMatch is 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.

In another application, a MeterMatch with minor modification is used to refill a generator fuel tank from the main tank. The MeterMatch monitors the fuel level in the tank, using the high/low alarm capability to control an external automotive-type relay to turn a pump on and off to refill the tank as fuel is used.



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. See below for optional wiring kit and alarm LED accessories.

MeterMatch MM-02

MeterMatch MM-02 - Price: $74.95 - includes priority mail shipping to USA addresses (see below for international shipping cost adders).

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:
Additional Shipping to Canada $22.50
Additional Shipping to Australia/NZ/UK/Europe $32.50

MeterMatch is designed and made in the USA. Sales within Washington State are subject to sales tax.



MeterMatch Wiring Kit...

The MeterMatch 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.

Alarm Indicator

MeterMatch 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 14mm (approx 9/16"), bright lens and installs in a 1/2" hole in panels up to 1/8" thick. It includes approximately 4.5" of hook-up wires, which can be extended. The Alarm Indicator is only available with MeterMatch purchase, and does not add any additional shipping cost.

Optional LED Alarm Indicator - Price: $6.00

Sun Water Temperature Sender

This is a high-quality sender for classic Sun "Blue Line" water temperature gauges. It is compatible with the WT-260 series of Sun gauges, which are nominally 2-5/8" diameter. This sender is 1/8"-27 NPT. Click here for more information.

Sun WT Temperature Sender - Price: $68.00 includes priority mail shipment to US addresses. Sales tax is collected for sales within Washington state (only).