On mine I pulled the speedo cluster out. On the back you'll find some interesting plastic "circuit board" wannabe dealy. You'll also see little metal prongs sticking thru that attach the gauges to the plastic "circuit board". Bend these back hard against the plastic and clean any contacts you find with a official use electronic cleaner. Ya know the kind that removes even paint!? Yeah this fixed all my problems after chasing nothing for weeks!
_ _ <br />1995 Chevy Crew Cab Dooley 6.5L Turbo Diesel (Under 1000 miles)<br /><br />TurboMaster set at 14lbs of boost<br />Heath Boost Gauge Kit<br />Spearco (BIG) Intercooler<br />Home made relocated PMD<br />Lots of cosmetic stuff