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I used heat shrink tubing...sry does sound like i used tape...i mounted the small bracket with 1/4-20 bolts and washers...i havent taken her out yet but i did have her running in the garage when i was done to see if the tach worked and there was a slight diff but the thing i noticed was the autometer responds alot faster than the stock tach...hmm should try to post a vid on youtube or something
The previous owner of my notch put a tach in that same spot, it ended up breaking that side of the cluster trim. It's a few 100 rpms diff from the factory one also, the shift light doesn't even work!
I have mine on the side of the cluster bezel and have never had an issue with it. No, its not the strongest point but a small metal plate on the back will help some. My stock tach is a few hundred behind the autometer I have....