If it's proper Autometer internal guts then you connect the green tach wire to
the coil negative terminal (the one that connects to the breaker points,
Pertronix black, etc.)
If you're using an MSD then connect the green wire to the MSD's tach output
terminal.
Cheers,
Theo
> -----Original Message-----
> From: tigers-bounces@autox.team.net [mailto:tigers-
> bounces@autox.team.net] On Behalf Of Rollright@aol.com
> Sent: May 30, 2011 12:28 PM
> To: tigers@Autox.Team.Net
> Subject: [Tigers] Auto Meter tach
>
> Hello,
>
> Well, the tach project is finished. Now I'd like to test it on the
> car
> before installation.
>
> The easy part is 12 Volts and Gnd.
>
> What can I hook the third "signal" terminal to?
>
> And finally, when I pull out the old tach, how do I hook up the new
> one.
> Yes, I know 12V and Gnd. I'm concerned and confused about the third
> terminal.
>
> Can anyone help?
>
> Jim Armstrong
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