Well I went to put my tach harness in and I had forgotten to drill the hole in the firewall (my car originally came with idiot lights). So, I got to practice taking off my drivers side fender so I could drill the hole. Fortunately there was a very informative thread on the subject which had pictures and an explanation of just where to drill. I should take this opportunity to thank all of you who freely share your knowledge and past experiences with others. It is the best resource for dealing with problems. I used a 1 1/8th hole saw to cut the hole. The grommet is used on two other places on the car, the blower motor wire where it comes out of the firewall (non a/c) and the passenger side core support where the forward lamp harness comes back into the engine bay for the right front corner light, so it's a pretty easy part to find.
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