DIS2 on a 90

[bdgtracr]

Alright, I'm sure you have all heard this before.
Anyone out there with a DIS2 on a 90?
Just installed one and now the factory tach doesn't work(tried the tach adaptor, still doesn't work).

 

[stevetford]

Did you use the MSD part #8912? Double check to make sure it was wired correctly. Good luck. Let us know what you find.

Steve

 

[bdgtracr]

That was the part used, and I'm positive that everything was wired correctly. Any thoughts??? Bad tach adaptor maybe???
The car starts and runs fine.

 

[stevetford]

Well, possibly a bad adapter but I doubt that. I am looking at the manual for the DIS2 right now and they show on page 15 using 2 of the 8912 adapters even though on page 14 they say you will only need 1????? You may want to call MSD on Monday and ask about this.
I am not sure if this will work for you or not, but this is how I wired up my DIS box and it works fine but my combo is completly different than yours but still may work. I am using the tach output of the DIS box and driving the factory tach off of that. I found the factory tach wire down by the fuse box at the left kick panel. There are 4 plugs down there that are for the dash panel harness only. There is 1 white plug that plugs into the fuse box, 1 smaller black pug on top of the fuse box and 2 white plugs on the right side of the fuse box. In 1 of the 2 white plugs on the side of the fuse box there is a white wire. This was the wire for the tach. You will need the shop manual or a very good wiring manual to get the exact plug and pin, but this was in the same spot on the same plug for both of my 90 and 91 Talons. I simply cut this wire and wired into the end going to the dash. I am sure this way will work for you as well, but like I said my combo is completly different than yours and I can not be held liable for anything that may happen. Please check this for yourself before cutting and trying. Good luck.

Steve