Customs 6 V, + ground gas gauge....

I’m doing the fuel system for my ‘52 DeSoto wagon and before the tank goes back in for good, here’s a dumb question: The car was 6V + ground. Now it’ll be 12V - ground. I’d like to keep the original gauges, oil and temp are manual and I have ports in the new engine to put the senders, ammeter I’m not using, and the speedometer I can drive with a pulse generator from the new overdrive transmission. Fuel gauges care about Ohms of resistance, not voltage or polarity, can I use the original gauge and sender, since they’re “matched”?


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you would need a runtz voltage reducer

 

Not arguing, but I've run GM 6V gas gauges on 12V and they work fine. My question is does the polarity make a difference? Or should I just get a new gauge and sender, and adapt the gauge to fit behind the original gauge face?

 

I am using the original gauges in my 55 Ford that were originally 6 volt positive ground on 12 volts with no problems,I did not have to reverse connections but did use a reducer.

 

I have never seen a 6 volt fuel gage work on 12 volts without a voltage reducer of some kind. they usually come into my shop with a gage that needs replacing. the senders don't care about voltage but the gages burn up.