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Q:

instrument panel on 1990 Chevrolet Astro

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
temp,oil pressure and speedometer are all not working on instrument panel. could this be wiring, fuses ?
(1) Answer
It's possible it's a blown fuse but that may not explain the speedo failure. Of course, connector or wiring problems may be the cause. You may need to find a GM specialist or an auto electric shop.
If you want to find a specialist, here's a directory link for you:
https://repairpal.com/directory?address=64804&car_brand_names=Chevrolet