[DeTomaso] Techno question: Tach malfunction

[Scott Mead Photography]

Chuck,

It sounds like the signal to the tach has become erratic.  I’d start by first checking the signal wire (red wire to tach adapter) to see if it’s loose or if the wire is damaged, as well as the 12V source wire (ignition to tach). 

Keep us posted,

Scott

Sent from my iPhone

> On Aug 23, 2020, at 4:28 PM, Charles Engles <cengles at cox.net> wrote:
> 
>    Dear Forum,
> 
> 
>                I was driving home after the Int'l  Drive Your Pantera Day
>   after an uneventful two hundred mile drive when about a mile from home
>   I noticed that the tach was not working normally.  The engine was
>   running fine and all other gauges read normal.
> 
> 
>               Instead of proper function or a completely dead tach, the
>   tach needle was bouncing around somewhat wildly between 2300 and 3800
>   rpm or so.  That ain't right.
> 
> 
>               I use an MSD ignition system and an MSD tach adaptor, which
>   is about twenty years old.   Is this a failure mode indicative of
>   primary tachometer failure or primary tach *adaptor* failure??
> 
> 
>                         Warmest regards, Chuck Engles
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