The easiest way is to use the stock car and engine harness. convert your engine harness to mpfi. Then convert the distributor to obd1. You can convert your injectors to obd1 if you choose. For the ecu get a conversion harness. Changing out the dash and engine harness is possible but a huge pain in the ass in my opinion and will still require some rewiring. BTW I know from experience my crx is obd1, this isn't just heresay.