I changed out my idiot light original install last year to the after market rally gauges on my 71 GTO. I had the under dash added gauge sets that I hated.
If you do a search for rally gauge under the PY search, you will find many posts regarding the change out, including some from Peter Serio. He ( Peter) knows more than pretty much anyone about how to change out, rebuilding and rewiring for rally gauge swaps.
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