Gary,
I have installed quite a few Speedhut gauges in Panteras. Yes I used the 4.5" gauges for the speedo and tach. I had my machinist make up aluminum/plastic adapters to make them fit in the stock( larger) hole. In my personal car I have a fiberglass L model dash so I could make the holes any size I wanted so no adapters were needed. I have used the GPS as well as the standard version. Both work great! I have also installed their GPS speedos in a GT40 and a Ferrari.
Ron
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