Rev Counter Mystery

ZMAD · Post by **ZMAD** » Sat Mar 05, 2011 9:27 am

I removed my 75 260Z rev counter and noticed an extra non factory wire going into the back of it. Being very curious I pulled this thing to bits. From what I can tell, something has been removed(2 wires taped back onto harness with a couple of holes left in rear casing. Also a circuit board was installed inside(the mystery wire went to this). Anyone know of mods that were done to these or know how they should look from factory, pictures great.

nzeder · Post by **nzeder** » Sat Mar 05, 2011 12:07 pm

Looks like at some point some one might have converted this from the factory + tach pickup (uses a loop setup which if the tach fails = no + to the coil = no go on the sparky thing) to a more modern - coil pickup. This little board will be the converter board to drive the tach.

Well that is my guess.

Ricky · Post by **Ricky** » Sat Mar 05, 2011 1:15 pm

Mike, you are on the money it’s a common mod to the Smiths tach that Nissan copied.
The original tach used a pickup loop to get a signal, this caused many issues and was dropped in the later 260Z.
Jags of the same vintage used the same method and the little circuit board you found was the fix used for Jags.

I have done this mod to my tach with the same board.

Cheers

ZMAD · Post by **ZMAD** » Sun Mar 06, 2011 11:33 am

Totally understand now. Thanks for shedding the light quickly. Can put it all back together(better than it was this time)and explain extra wire to customer.