Most of the engine gauges on my 1979 J/30 aren't working. I have a cluster of 5 guages - Tach, Temp, Oil Pressure, Voltage and Engine Hours. The only two that are currently working are the Voltage and Engine Hours gauges. I have gone through the wiring diagram on the J/30 Class website and everything seems to be hooked up fine. I was wondering if its possible to hook up an Ohm meter to the connections on the back of the gauges with the engine running to make sure there is actually something going to the gauges - and if not, then I know the gauges are bad, and not a sensor. Does anyone know what kind of readings I should be getting on the gauges?

Thanks in advance.