A "house style connector" does not sound right, maybe somebody modified it. Any way, there should be four wires in the tunnel. Two go to the reverse light switch on the transmission. The other two are for the starting interlock switch on auto transmissions. For manual cars, the interlock wires were just jumpered together at the tunnel plug to complete the circuit. Before jumpering them together, I would use a volt ohm meter to make sure that is what you have (especially if it is not stock). If it is the starting interlock circuit, one side should go the starting solenoid small wire terminal (non-coil side) and the other one goes to the ignition switch start out put (for 71-73 Pinto's). Later years may have added extra complexity to this circuit.