Testing gauges individually?

[440beep]

For some dumb reason I pulled my 69 Ralleye dash out of the Bee in the middle of summer, but anyways, if I want to individually test the gauges, are the mounting studs the negative/positive? Can the gauges even be tested individually?

Picture is the back of the Ralleye dash, with the gauge pod studs, kind of nasty.

 

[RJRENTON]

For some dumb reason I pulled my 69 Ralleye dash out of the Bee in the middle of summer, but anyways, if I want to individually test the gauges, are the mounting studs the negative/positive? Can the gauges even be tested individually?

Picture is the back of the Ralleye dash, with the gauge pod studs, kind of nasty.

View attachment 1488018

IMO....since the instrument panel voltage regulator reduces 12 volts DC to approximately 5 volts DC, to power the gauges, the individual gauges are simply volt meters, calibrated to read fuel level, temperature or oil pressure respectively through their resistive "sending units". By varying the resistance of the sending unit, the respective volt meter will read upscale. Since the individual instruments are thermal devices, deliberately slow to respond to dampen out fluctuations, they can be individually tested with a variable DC supply of 0 - 5.0 VOLTS (maximum). The most common cause of inoperative instruments is the instrument panel voltage regulator, followed by bad ground connections.......
BOB RENTON

 

[davek]

this might help

 

[davek]

Testing gauges out of the car....

I'm trying to get all the gauges working in my "Jigsaw" '70 Charger. Currently, everything works except for the oil pressure and temperature gauges. I want to replace just the bad gauges with used ones for now. Eventually, I'll have the cluster restored. I have 2 other gauge clusters to pick...

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