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Fuel Tank Sending Unit

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We knew going in that the '87-'90 fuel tank sending unit ran on a different ohm range than the later '91-'95 one. The early reads 1 ohm at empty and 88 ohms at full, whereas the later one reads 88 ohms at empty and 1 ohm at full. Since the sending unit can't be taken off the fuel pump assembly reliably (it took destroying two before we admitted it) and the sending unit isn't available on its own (you need to buy the whole fuel pump/sending unit assembly), we just ended up swapping in the entire HO fuel pump assembly. We were concerned with the higher pressure causing issues, but the truck ran fine and nothing leaked when we were done.