Re: Tachometer Pos or Neg?

[Frank Clarici <spritenut@Exit109.com>]

Daryl May wrote:

> My tachometer comes off of a 1967 Midget donor car, which has long since
> been stripped of electricals and related labels.
>
> I am wondering whether the tacho is pos or neg ground, since I gather that
> 1967 was a changeover year.  Is it possible to tell by looking at anything?
>  Or, to get to the point, how can I make it negative ground no matter what
> it is now?
>
> Thanks,
>
> Daryl

  Daryl

67 tachs are (were if not PO converted) positive ground.
If it is a large faced tach, it is positive grd.
The smaller faced tachs, 68 and up were all neg grd.
It should say Positive Earth on the face in small print.

Frank