Ok i just swaped a 89 d15b from out of a ef front clip into a 91 civic dx. The dx was dpfi ok so i no i gotta switch it over to mpfi i no that much. But when i went to put the dx harness back on i noticed that the d15b only had one plug on the back of the block. I really can't explain what they are but i took pictures any help will be really helpful thanks..

this is the back of the d15b2


this is the back of the d15b


Picture of full motor

 

on the d15b2 it has the oil pressure, and the coolant temp sensor on the back the green two prong one is the coolant temp,the single one is oil pressure? just hot wire your fan in the fuse box and be done with that lil problem!