You should make one thread about this. Include year make and model. Do you have a gauge or an idiot light?
What do you mean what temp does the truck run off of?
Do you mean where is the engine coolant temperature sending unit? If so that is located in the LH cylinder head next to the exhaust manifold.
The oil pressure sending unit is installed in the back of the engine near the firewall on the LH side. Some also used and oil pressure switch and can be located next to the oil filter in the cylinder block.
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