Tachometer and speedometer speedometer not working
 

I did a search but didn't see anything matching my situation.

88 Carrera. My tachometer stopped working completely. The speedometer doesn't work but when I accelerate up above 60 mph the needle jumps up and stays there. The odometer is working fine. What should I check before bringing it in to the shop?

Check the grounds behind the gauges, make sure they are clean and tight.