need to know which sending unit you are looking for, there are several sending units on that vehicle.
how do you replace the fuel sending unit
It is on the firewall end of the intake manifold below the distributor
In the fuel tank. Fuel tank must be removed to gain access to the sending unit.
In the fuel tank. The fuel tank needs to be removed to gain access to the sending unit.
The fuel tank has to be removed to gain access to the fuel sending unit. The fuel sending unit and the fuel pump is replaced as a unit.
Assuming you mean the engine coolant temperature sending unit, we need to know what engine it has, it makes a difference.
The reading will vary from empty to full.
Probably the sending unit inside the fuel tank is bad.
At the rearmost section of the engine to the right of the distributor.
Could be a faulty temp sending unit.
There are actually two water temperature sending unit on a 1994 S10 Chevy. Please locate the unit close to the thermostat housing, and not the one between spark plugs. The single wire water temperature sending unit should then be attached to the temperature gauge. The two wire unit, the one between spark plugs, would be connected to the engine control module.
The 4.3 temp sending unit for the gauge is located in the drivers side head between spark plugs 3 & 5.