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Modified '67 bullet tach with MSD started reading X2

sputnik 440

Capt Jim
Local time
8:46 AM
Joined
Feb 16, 2016
Messages
248
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Location
Norfork, AR
I have an original bullet tach in my on my '67 console that has been modified to accept input from my MSD. It has been reliable for the last 3 years and for some unknown reason, it started to read twice what it should. Any ideas of how to troubleshoot. According to the invoice I got back when it was serviced and the electronics altered, the "guts" were modified in Europe. I believe Germany.
 
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