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How can I troubleshoot my 2-1/16" Comp II LED Gauge?

Each Comp II LED 2-1/16" gauge is checked multiple times during production and again before each gauge ships. Most problems are caused by improper installation. You can confirm your gauge is OK by performing the following quick checks with a standard 9V battery (make sure battery is fully charged).

Confirm Gauge Powers Up Correctly

  • Volts: Place the + battery terminal on the gauge "I" terminal and the - battery terminal on the gauge "G" terminal. The gauge will move to 8-9V (depending on your battery voltage.
  • Pressure & Regular Fuel Level Ranges (0-90, 0-30, and 73-10 Ohm): Place the + battery terminal on the gauge "I" terminal and the - battery terminal on the gauge "S" terminal. The gauge will move to left side of scale.
  • Temp & Inverse Fuel Level Ranges (240-33, 73-10 Ohm): Place the + battery terminal on the gauge "I" terminal and the - battery terminal on the gauge "S" terminal. The gauge will move to right side of scale.

Confirm Gauge With Simulated Signal
To verify operation of the gauge with a simulated signal (not necessary for VOLTS gauge) you will need a 9V battery, some 18-22 gauge wire and a 100 ohm resistor (other ohm value is OK also but gauge output shown below will vary). Connection power and signal as follows:

  • 9V+ to gauge "I"
  • 9V- to gauge "G"
  • One end of resistor connected to 9V-, the other end connected to gauge "S"

For a 100 ohm resister, the gauge should go to the following approximate positions:
  • Pressure: 80+ PSI
  • Temp: 180-200F
  • Fuel Level (0-90, 0-30 Ohm): Full+
  • Fuel Level (20-150 Ohm): 1/2 - 3/4 FULL
  • Fuel Level (73-10 Ohm): EMPTY
  • Fuel Level (240-33 Ohm): 1/2 FULL

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