I don't know if a 1976 model IH truck still used them but all the loadstars and several previous model IH trucks that I worked on used a voltage regulator to feed the gauges.
When that regulator failed it would normally make the oil pressure gauge read zero and the temp gauge read hot.
The idea behind the regulator was to provide a constant voltage to the gauge regardless of battery or charging condition. It would regulate a pulsing voltage in the vicinity of 7 volts if I remember right. Has been like 50 years since I worked on one.
It is just a little box behind cluster with input from ign and wires out to the individual gauges. Also, calling on memory again , I believe all the gauges had to ground to cluster and cluster to panel.
We quit selling trucks some where about the time IH started using American motors engines etc in the pickup trucks so been a long time.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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