How to test gauges to make sure they are working?

Hello,

I am having a problem with trying to get my gauges to work in my dads 70 chally. I tried grounding the sending unit wire to see if the gauges moved with no luck. The gauges that do not work are the fuel gauge and coolant temp gauge. The alternator gauge works fine. Is there a way to test them out of the car as I currently have the instrument cluster removed since I had to repair the speedometer also. Any way to test the voltage limiter outside of the car also? I am considering changing the stock style limiter to a solid state one for more reliablilty and acuracy of the gauges (when I get them working).

Thanks,

Brian

A voltage applied directly the gauge of 1.5-3 volts (1 or 2 flashlight batts) should give a mid-range reading. Full reading should be about 4.5-5 volt. That test will at least determine that they are not DOA. If you apply 12 volts to the limiter you should get an intermittant 12 volts at the output--think morse code, on off on off like a turn signal flasher. The AVERAGE output of this low tech device will be about 5 volts.

If the fuel, temp and oil are all not working, most likely you need to replace your voltage limiter.

The chally has the standard gauge package, not the rallye gauges. There is only an idiot light for the oil pressure.