They are only useful (in the dash) if you have fuel injection...that way you could spy why your motor was sputtering, if that be the cause, matey... ditto to the ABSOLUTE need for an isolator unit... the problem there is that the Autometer isolator was like $350 !
The gauge itself was cheap... if mounted in the motor compartment it would not cost much, but then you can only view it with the hood up, kinda hard to drive that way
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