John G
Thanks.
The GPS speedometers I have seen so far look to sweep from the 7 oclock to 5 oclock position. The sweep on the 56 cluster I have looks to go from 9 oclock to 2 oclock.

So I think finding a GPS with the correct sweep could be an issue. I will keep looking.

If not I can always go with the option in the picture.
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Rock49 aka C-Rodg
work in progress
1956 Chevy 3100
261 engine