Socal_Tom

Good morning gentlemen, hope everyone is doing well.

I have a 1984 with a 1988 S4 engine in it, and my tach is reading 1/2 the actual engine RPM. I've ordered Bob's Tach Adapt which will allow me to double the signal. I need some coaching, please, on where to connect the doubler so the tach picks up the revised signal but I don't cause problems with anything else that needs the tach signal.

Any suggestions?

Bob's a great guy BTW, I was customer #2 for this when I ordered one for my 911 years ago. Its great to see how successful this product has become for him.

Thanks!

Socal_Tom

daveo90s4

Socal_Tom

Hi Mate, thanks for the note back. The wiring was easy on the 911, and would be on the 914 as well but I believe the tach signal gets used for multiple purposes on our 928s. The actual input to the tach comes from a circuit board so I need to put the doubler in prior to that, but I am trying to make sure that I don't do that in a way where I inadvertently double the tach output somewhere else it is needed.

This THIS THREAD suggests it is a single green wire off the CE.

Thanks!

Socal_Tom

Just to close this out in case anyone else finds this thread in the future.

G7, green wire. G is the 7th block on the bottom from the left, #7 is wire second from the top and green