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> > I have a 6-volt car. Can I hook up a 12-volt tach? I assume it > > will read correctly but are there other things to consider? > > Are you talking about a tuneup tach? If so, I think most such tachs > are voltage-independant. It should work just fine on either voltage. > > A dashboard tach may be different. If it has a wire that needs to be > run to a 12V source (other than just to light a lamp) then you are > porbably out of luck. I found an old VDO tach (3" diameter) sitting under some stuff in my garage but it's 12-volt so I was wondering if I could put it under the dash. I'll probably just hook it up directly in the engine compartment to see if it seems to work... Thanks for the feedback, Everett