Sorry I have been so busy I haven't had a chance to check in.
It is a 91.
While the harness is not very pretty that wire is the only thing that is off.
I've owned the car for a long time but don't remember if it came with this wire exposed or not.
It never had an aftermarket tach. so I doubt that is it but no way to completely rule that out.
The car ran well with this wire as is but as I am putting it back on the road I thought I might try and figure out what that wire is.
I did add that wire as a ground and it looked to me as that corner of the DIS is a ground point. I will change it if that is not the case. Tks for the heads up.