The wiring diagrams weren't much help. They only showed 3 wires. Grey to pin A for power, black to ground, and purple from pin B to gauge.
And the pic of a 95 pump on Rockauto shows just those connectors:
Sounds like you got sent the wrong pump. Later trucks 96+ had a separate 3 pin connector for the fuel tank pressure sender that's part of the evap system pressure test and the primary connector was 4 pins for the pump power, gauge, and 2 grounds. IIRC the gauge is grounded at the PCM. Hence separate grounds.
95 1 - 2 pin and 1 ground eyelet
96+ 1 3pin and 1 4pin