the wire is cracked in the terminal or the wire could be cracked at some place where it vibrates and "microflexes"(good luck finding the spot).
I'd pierce a straight pin into the wire before the terminal and alligator clip a wire from the straight pin to the terminal and see if the gauge works then.

Last edited by KrzyDav; 04/18/13 05:09 AM.
dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.