Thanks.
Ah so! At the risk of showing my lack of knowledge and as the subject is a retroactive item now its redundant , so just some thinking (?) out loud here. I have to practice my electrical skills, as this old fool is going to try a fuel injection engine transplant!
So the old-time ammeter was in series with all the current (except starter) went through the meter (dangerous), newer cars (1950 12v) dash ammeters weren't, they where shunt voltmeters calibrated to read in amps that are wired in parallel to sense battery voltage.
The circuit for your (and my) voltmeter is from a switched power source through the gauge and to ground, if you getting a short (and you are) then I think maybe its not the gauge but somewhere in the circuit that feeds it is shorted to ground.
But what the hell do I know!
Ah so! At the risk of showing my lack of knowledge and as the subject is a retroactive item now its redundant , so just some thinking (?) out loud here. I have to practice my electrical skills, as this old fool is going to try a fuel injection engine transplant!
So the old-time ammeter was in series with all the current (except starter) went through the meter (dangerous), newer cars (1950 12v) dash ammeters weren't, they where shunt voltmeters calibrated to read in amps that are wired in parallel to sense battery voltage.
The circuit for your (and my) voltmeter is from a switched power source through the gauge and to ground, if you getting a short (and you are) then I think maybe its not the gauge but somewhere in the circuit that feeds it is shorted to ground.
But what the hell do I know!