The Faria Gauge Tester is a gauge substitution box designed to check the correct operation of marine engine electrical instrumentation.
For diy gauge testing, initiate Gauge Resistance mode in minimum or maximum position, slowly rotate control knob until gauge pointer moves from initial starting position, keep rotate the control knob until gauge reads full scale opposite from initial starting position, then return it to initial position (you will see pointer return to original starting position smoothly), repeat test and observe pointer for smoothness of operation.
Note for gauge resistance: Rotate clockwise for decreasing resistance, and counterclockwise for increasing resistance. (source: faria-instruments.com).
