I think you will find that the adapter only fits in one place with the tach attached to it and have flush contact with the chrome bezel. It has been a while, but I think mine had 2 bolts that held it on. and a hole in the center for the wiring. I think I had to do one bolt from the top without dash pad on and one from under the dash.
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"If you do everything you'll win"
-LBJ
13 Smiles per Gallon:
66 Bonneville wagon
66 Bonneville 2d HT - In perpetual progress
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