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MeterMatch
™
Overview
The MeterMatch™ Model MM-02 by TechnoVersions LLC is for
making analog gauges more accurate, or to allow you to mix
and match different gauges and senders. It can be used with
many gauges that have resistive senders - such as common
fuel, oil-pressure and temperature gauges. In addition, it allows
you to have low and/or high set-points that will trigger a bright,
flashing LED indicator to alert if the gauge exceeds normal
values.
Note: If you are having trouble reading the small print of this instruction manual, go to the
TechnoVersions.com website and open the on-line copy that you can print out full size.
Theory of Operation
MeterMatch is wired between your sender (sensor) and your gauge. It reads the resistance of the
sender, then based on the calibration values, controls the current through the gauge to drive it 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 is reversed - it can correct for
that. In the graphic above, prior to installation the green lines would be connected together.
MeterMatch interrupts that signal to process it and make corrections.
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 Up and Dn buttons, make your gauge read what you
want for that sender value. When you are happy with that, press the Save button, and the value is
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Summary of Contents for TechnoVersions MeterMatch MM-02
- Page 1 Note: If you are having trouble reading the small print of this instruction manual, go to the TechnoVersions.com website and open the on-line copy that you can print out full size. Theory of Operation MeterMatch is wired between your sender (sensor) and your gauge. It reads the resistance of the sender, then based on the calibration values, controls the current through the gauge to drive it to the desired reading.
- Page 2 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. If you know the resistance of your sender, you can also calibrate to common values, even without the sender being at that specific resistance.
- Page 3 Installation To install and calibrate your MeterMatch, you will need to expose the circuit by removing the small #1 Phillips-head screw in the bottom center of the enclosure. Take care that the circuit board doesn't touch any metal which could short things out, and when finally installed, make sure it is in a dry spot that doesn't get overly hot.
- Page 4 Standard calibration process (sender resistance not known): Note: Using this technique, it’s necessary to have the sender matching the gauge position being calibrated. For example, the tank needs to be empty when making the gauge read empty, full when calibrating full. It doesn’t need to be calibrated at the extremes, could be ¼ and ¾ for example, but best accuracy is achieved when near the end-points.
- Page 5 Method 1: Connect a resistor (available at places such as Radio Shack) of the desired value on the MeterMatch sender input pin (pin 4) to ground, then perform calibration at that point just as with the standard calibration process previously shown. Method 2: You can have MeterMatch calibrate to some internally stored resistance values.
- Page 6 Voltage Correction Most gauges are connected to a voltage regulator in the instrument wiring so that they get a constant voltage whether the engine is running or not. However, if this is not the case, when you calibrate your gauge at one voltage (for example, engine not running, battery at +12.5V), then start the vehicle and the voltage rises (for example to +13.8V), the gauge reading might change significantly.
- Page 7 (cathode) in parallel to each MeterMatch (Pin 5). Return Policy If a MeterMatch unit does not work properly in your application, and is not damaged, TechnoVersions will allow return for full refund of purchase cost, exclusive of shipping charges. Claim for such must occur within 30 days of product shipment from TechnoVersions.
- Page 8 MeterMatch will be shipped to the customer via USPS or UPS ground at TechnoVersions expense, except for shipments out of the US, in which case TechnoVersions shipping cost is limited to the cost of domestic shipments. When returning MeterMatch to TechnoVersions, include a description of the fault to help facilitate repair.
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