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5. Release the Save button, then use the standard calibration procedure (rotary switch Ѳ to which
point you are setting, Up/Dn buttons to make gauge read the desired setting, then Save). When the
Save button is pressed (and the rotary switch Ѳ is not set to 0), MeterMatch will use the resistance
value you just entered, and then reset itself to back normal operation (measuring the connected
sender resistance).
Calibration Checking and Enhancement
Feel free to use a combination of these calibration methods. For example, you might initially calibrate
to the published resistance values of your sender, then when the opportunity comes to improve
accuracy, recalibrate a point. Using the fuel gauge, for example, recalibrate the end-point when you
run out of gas, or fill up the tank. Whenever you return to a position of the rotary dial, you can over-
write the data that was previously programmed.
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), when you start the vehicle
and the voltage rises (for example to +13.8V), the gauge reading might change significantly. If you
run into this, MeterMatch has an automatic voltage correction feature that corrects the reading for
different voltages. To enable this feature: (a) remove power from the MeterMatch, (b) set the rotary
switch Ѳ to position "0" (normal operating), then (c) press and hold the Up button while applying
power to the MeterMatch. Hold it for at least a second after power is applied. MeterMatch will
remember this setting in future use. If you wish to remove the voltage correction feature, repeat the
same process, but hold the Dn button rather than the Up button. Note that if you change this setting,
the gauge will need to be recalibrated with the new setting.
Installing/Programming the Alarm Indicator
The optional LED Alarm Indicator can be mounted near the gauge being controlled.
The LED is installed by drilling a 9/16" hole in the instrument panel. 12" leads are then wired to the
terminal strip in the MeterMatch. Be careful when installing the LED since the leads are not
particularly strong, and can be pulled loose from the LED. The darker of the two wires (cathode
lead) coming from the LED is installed in terminal strip pin 4, and the lighter-colored wire (anode side)
is connected to pin 5. It won't hurt anything if you accidently reverse these wires, but the LED won't
light.
Pin 4 LED negative (cathode)
Pin 5 LED positive (anode)
You can program the upper and lower alarm points with rotary switch Ѳ positions 5 and 6
respectively. Set the rotary switch Ѳ , use the Up/Dn buttons to set the desired gauge reading at