Join Date: Feb 2007
Location: Happy Valley, Oregon
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Blowinsmoke7.3's problem could either be an intermittent connection to the temperature sensor, or an intermittent connection between the amplifier box and the gauge head. Most likely culprit is the connection down near the temp sensor, pull it apart and check for corrosion on the contacts. Try scraping the contacts with a tiny screwdriver, then add some dielectric grease when reassembling. If that doesn't fix it, check the resistance of the sensor. Here are the nominal values:
Res Temp °F
If it is significantly off of this curve, then you have a bad sensor. If the values look good and the connection is cleaned up but you still have a problem, check the set screw connections on the wiring going into the amplifier box. Next check the connections going into the back of the gauge. If all these things check out and you still have a problem, then it likely has an intermittent connection within the amplifier box.
Your trans temp sounds like the same thing as above. The pyro sounds like a bad connection to the thermocouple. Check the connection between the amplifier box and the thermocouple. If you have a good multimeter which can measure down to the millivolt range, try disconnecting the thermocouple and measuring the voltage across its wires. At 290°F (idle for most trucks) you should see about 5.01 mV. If that checks out, along with the connections to the amplifier box, then you probably have an intermittent connection in the amplifier box.
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