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I am not sure, but it would take some work to use one of the other gauges...

All the "other" gauges are actually just voltage gauges, they measure the voltage coming from the sensor (oil pressure, fuel level, temp). It is theoretically possible to convert one of these gauges to read raw voltage between 8-16 volts.

It would be a matter of using a resistor divider or something else to convert the voltage range the gauge reads (0-5 v, lets say) to 8-16 volts.

It would take some engineering / work to work out the details to make it work... but it MIGHT be possible



Although it might be possible, aren't the other gauges damped to some degree by the heating of the resistor wire that constitutes the needle movement? I'm thinking that the slow response time of a gauge like that would make it pretty useless as a voltmeter. Voltmeters are much more useful when you can read instantly when the voltage drops or rises depending on load/alternator output at idle, etc.

Just my $.02.