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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