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Discussion Starter · #1 ·
Hello all. I'm new to the group, so please be patient.
My '74 Formula tachometer does not work properly. If I "tap" it after staring, it shows RPMs, however when I turn on the headlights, the tachometer shuts down completely.
I have ordered and received a new board for the guage cluster. Before I tear into the dash, I wanted to see if anyone had any insight as to what I might look for.
Thanks in advance.
 

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Discussion Starter · #3 ·
I'd run a designated ground wire to the tach if all the other gauges work right. Sounds possibly like the headlights are pulling it's ground. I'd check the headlight's ground as well.
Thanks, I'll look at that tomorrow and post results. (If my wife lets up on the "Honey, do this before Thanksgiving" list....)
 
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