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Lose of power or ground since all the gauges quit working.
Bad dash ground.
If both the speedometer and odometer stopped working it is probably the speed sensor in the transmission gone bad. If only the speedometer quit you may have to replace the dash cluster with a reconditioned unit.
check the fuse panel
Blown fuse.
GM. quit uesing Carburetors back in 1987. Everything is now fuel injected.
I have a 84 camaro and went all winter without heat,I asked my boyfriend to see what could be the problem,well that did not accomplish anything,so I changed the fuse,guess what I have heat...
check your ground wires...they might be loose or detached.
The two items commonly share a power fuse.
the dashboard cluster could have broken. That happened to my 2004 trailblazer and I had to get it replaced
Check to see that noone has used it for a coin holder. It is fused.