Hey Blitz,
All Porsche gauges (early) are the same dia (100mm) and the overall dia at the ring is about 107 to 108 mm. Check gauge depth and the depth available. Try to secure them very well cos if they touch the metal frame of the dash they short-circuit, damaging the gauge and probably burn a fuse or two (personal experience...) A good mounting practice is to use the rubber band that come with the gauges.
Hope this gives you some insight
Chris
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Aircooled 4ever
1973 1303 going towards GL
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