If it has the larger face, it should be the positive earth type. There are
instructions on the PDLJMPR on how to do this (which I still haven't used
despite the excellent soldering lesson)
Patton Dickson, Dallas, TX
From: Daryl May <email@example.com>
To: spridgets@Autox.Team.Net <spridgets@Autox.Team.Net>
Date: Tuesday, April 21, 1998 10:14 PM
Subject: Tachometer Pos or Neg?
>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?