[DeTomaso] Techno question: Tach malfunction

[Charles Engles]

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

-------------- next part --------------
   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