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Connect sender wire from fuel gauge to the threaded screw terminal on sender connect ground wire to 1 4 fasson terminal on sender gasoline is extremely flammable keep tank area free from sparks and flames empty tank of fuel and fumes before continuing with installation gauge and sending unit wiring diagram and industry recommendations. Using an ohm meter check the ohm readings with the sending unit out of the fuel tank full 32 ohms empty 240 ohms half 110 ohms if the readings are good on the sending unit check your continuity of the ground of the tank and sending unit here is a diagram of the wiring. The fuel sending unit is responsible for what the fuel gauge on your vehicle reads there are two types of sending units the older float style which uses a magnet embedded in a float that resides in a tube sending readings of how high in the tank it is floating and there is the newer style that measures electrical . The length of the sender arm may have to be modified to fit the dimensions of your fuel tank this also ensures that the gauge reads properly first measure tank depth from the top of the tank near the sending unit to the bottom this measurement determines the length of the sending units float arm