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58 gmc1/2ton truck with electric fuel pump. Adding a 3 wire oil pressure switch for the fuel pump. everything is done EXCEPT where does the wire go on the ignition switch? Here is the switch terminals : batt , ign1, sol, ign2, acc

Ran a wire to the starter; ran a wire to the pump; both with fusible link , third wire goes to the ignition switch BUT which terminal? BATT , IGN1 , SOL , ACC , IGN2

Thanks in advance