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Username Post: Bench Test Factory Tach?        (Topic#361244)
Posts: 2

Reg: 06-02-20
06-02-20 10:00 PM - Post#2795526    

I found my Dads 66 in a barn where it sat since 1973. The mice did a number on it but its almost back together. I cant seem to figure out the tach. Is there a way to bench test it? I have the pink and brown wires on the the same posts they came off, and the ground appears to be grounded. The pink wire is in the top left accessory port on the fuse block and the brown wire is on the coil. Any suggestions?


Posts: 262

Loc: Connecticut
Reg: 12-01-07
06-04-20 02:48 PM - Post#2795670    
    In response to Impala66SS427

Before I installed the factory gauges in my 68 after a complete frame-off, I tested all of them on the bench. The tach was tested with a spare distributer using a cordless drill to turn it. Because it's a variable speed drill, I could start slow and go up to 1000rpms. I double checked the factory tach with a tach and dwell test meter. That also read 1000rpms. I used a 12vdc power supply to feed the hot side of the meter circuit.

Don S.
1968 SS427 x 4
1968 Impala L-72
1969 Chevelle SS396

Edited by 68SS427 on 06-04-20 02:48 PM. Reason for edit: No reason given.

Posts: 2

Reg: 06-02-20
06-07-20 08:08 PM - Post#2795858    
    In response to 68SS427

Thank-you! Great idea!


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