single cam 240SX's (89-90) had a white cluster plug

twin cam 240SX's (91-94) had a brown cluster plug.

the cluster plug is the one that goes up behind the glove box.

this should be the only plug inside the cabin of the car (besides the ECU plug)

if there is another plug off the harness inside the cab where the plastic holder makes a 90 degree turn behind the blower motor it will be the plug for the automatic ecu. to tell if you have an auto SR harness, look at the TPS sensor plug. if its 3 wires, its manual. if its 6 wires, its auto. do not worry about the second plug then.

is the 240 youre puytting this motor into a HICAS? does it have ABS? if so, this opens up a whole new world of headaches, bc then you have to strip the ABS sensor wires from the KA harness and graft them into the SR harness, etc.....