If you need one my bud has one from a renix at his junkyard. Looks like it was new, painted and then they junked the jeep. He said $50 for tank and pump assembly.
its going in the bed of the 90 comanchee but the filler neck of the comanchee tank is going the wrong direction so as long as my sending unit fits it i dont care what its from.
your sending unit will only fit in an MJ tank, IIRC. But a 90-down XJ sending unit and a 96-down XJ tank fit together, and if you don't care about the fuel gauge going backwards you can use up to a 95 sending unit.