There are several sending units in that vehicle such as the fuel sending unit, the oil pressure sending unit, the temperature sending unit. Need to know which one you want to change.
The 1994 Chevrolet Astro V-6 engine temperature sending unit can be located on the front of the engine. The temperature sending unit will be next to the thermostat housing.
You failed to mention what sending unit you are referring to suac as fuel Or oil.
The fuel sending unit for the fuel gauge would be located in the fuel tank.
You need to drop the fuel tank to gain access to the sending unit assembly.
Check for power and ground to the sending unit . If you have that then ground the sending unit and see if it works.If the gauge works then the sending unit is defective.
It is on the drivers side head.
It is in the gas tank.
in gas tank
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.
Check for power and ground to the sending unit. If they are good then you have a bad sending unit.
Please help.....Where is the oil sending unit on a 2004 Chevrolet Siverado V-6 4.3