can a negative ground tach be hooked up to a positive ground 
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I would think it would have to be due with whether or not there are Diodes or circuit boards inside with same.
Usually if it is a self contained unit with no sender, it IS quite Electronic requiring the correct polarity.
I am not sure, but I do know that they all are Cylinder sensitive, made for only 1, or to switch to 4, 6 or 8.StudeRich
Second Generation Stude Driver,
Proud '54 Starliner Owner
SDC Member Since 1967 -
I have a 6V Stewart Warner that picks up from the coil. Like Rich said there is a diode in there and my auto electric guy is trying to convert it to pos ground. He's been busy. Would have liked to have it operational for the PSMCDRS. Maybe next year.Dave Warren (Perry Mason by day, Perry Como by night)Comment
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the reason I need the tach is to run the correct RPMs so I can check tranny vacuum I'm thinking maybe hook it to the coil then the neg on my neg ground on my jeep ?Comment
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