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There are two in the front of the drivers side head.
One does the light, this is the lower one by the exhaust manifold.
The other one is actually in the block at the front of the head and located higher on the motor, it is for the guage.
Stand beside the truck and look by the power steering pump for the light sending unit.
Stand in front of the truck and look below the left side of the AC compressor for the guage sending unit.