What year is the P75? If it's from a '96+, it's not going to fit, the ECU is OBD II. You need a '94-'95 P75. In a pinch, you can probably re-use the stock DX ECU.
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Andy - Reinstated
Hybrid Forum Moderator
'06 Subaru Legacy Spec B - Stock, for now
'98 Civic EX - CTR headlights and grill, Kosei K1's, for sale
'90 240SX - SR20DET that will never get installed, project car.