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If the truck is similar to the Montero, the fuel pump and the gauge sender unit are both mounted towards the top/front of the tank. The sender unit mounts in a separate hole next to the fuel pump, and has a separate gasket. For comparison go here: sooper-sekret linky and look at the '92 Montero FSM for engine, chassis, body. Look at the drawings starting on page 13-97 and compare with what you've got. The drawings show a separate mounting for the sender unit on the driver's side of the fuel pump mounting location.

Yeah, that's quite a bit different than the Max. I don't have easy access through the bed, so I guess I'll just have to rig up some kind of mirror probe and check it out myself with a flashlight when it isn't cold and rainy out...

1992 Mighty Max 4x4
3.0 5-speed
Herculined bed