Join Date: Feb 2007
Location: Happy Valley, Oregon
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This is an unusual set of symptoms. The shield wire for the thermocouple (pin #6) is not necessary in most applications, but also should not cause any issues. It is just necessary to meet the high standards for electromagnetic immunity in SAE testing.
Could you please double-check the wires to the gauge? Starting from the driver's side, when the gauge is in its normal orientation, pin #1 should be red (ignition), #2 orange (dimmer), #3 black (ground), #4 yellow (thermocouple +), #5 red (thermocouple -), #6 bare copper (shield). Please note that there are two red wires, the one from the truck ignition should be in pin #1, the thermocouple one should be in #5.
Please let me know what you find, and we'll proceed to the next step.
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1995 F350 PSD CC DRW, 271k miles
10 ISSPRO Performax™ gauges, Tymar Intake, Gutted EBPV, Tymar 3x4" DP, Tymar 5" exhaust, Cat's lost, Baby Swamps, Swamps tuning, Tricumulator springs and Accumulator Valve, Tru-Cool 4590
1998 S&S 9.5' slide-in camper
33' enclosed tag trailer with 2 drag cars (73 Vega Super-Gas & 74 Vega ET)
92 GMC Typhoon, 73 Chevy Blazer with Pontiac 400, 73 T/A 455
GOA, IDPA & NRA member and certified firearms instructor