LMC truck may have it, may
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The 1988 rangers should have all used the low pressure pump(7psi) in the tank, and the old 73-10 Ohms senders, 1989 and up use 16-158 Ohms senders.
But when Ford added fuel injection they added a high pressure pump in the frame rail and a Return line from engine to tank, the second connection you are finding, that will certainly be more common since most Rangers were fuel injected in '88.
So worse case would be to get the 4 wire/2 hose in tank assembly and block off the return connection, just cap it, and use your old 2 wire connector spliced on new assembly.
Although there should be 4 wires at the tank, 2 for Fuel pump, 12volts and Ground, and 2 for fuel gauge sender, 5 volts and ground.