Suzuki 2 Strokes

I am working on a 1977 GT500. Looking for Instrument Gauges, and DO NOT have to be original. Can anyone offer advice on :

Does anyone know, if any other Suzuki models fit ?, for example could I use GT250 gauges.

Does anyone have any detail on aftermarket speedo and tacho I could use ?

Thanks Trevor

I'm not certain but I think the GT550 J/K speedo / tacho are the same as the GT500? (no gear indicator?)
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Mike

Looks the same to me. Actually they were nicer looking than the later years (380/550). The gear indicator was just a gimmick. Who actually looks at it?