After making a base for the tach surround, this is what it looked like.
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I put some of my daughter's Play-Doh in the bottom of the hole and inserted the tach. That let me see where I needed to remove material at the bottom of the hole to make room for the wiring.
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I removed a lot of material so there would be plenty of room for the wiring connections and drilled a hole through the base and into the tach opening. I tapped the hole and installed a hollowed out piece of threaded rod to attach the tach to the console. After sanding and polishing it turned out really nice. It obviously doens't look exactly like a factory part but I think it has that factory vibe.
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Here's the finished console. I polished the original clear plastic shift indicator lense with Meguires PlastX polish. It turned out really nice. The metal plate under the lense was repainted with SEM Trim Black.
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