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ill try to help you out- but you really need to research this- i dont know what what ecu a p4 is, but you should run a p28 ecu. it is an obd1 ecu- so you need to buy a jumper harness that will allow you to plug an obd1 ecu into your obd-0
wiring. This harness will also have wires coming off of it to run to your vtec solenoid("v-tech plug") and i think its the pressure switch your talking about(next to the distibutor) the 1 wire plug will run back to your ecu and connect to your jumper harness, and the 2 wire plug will have one wire got to the jumper harness and one goto a good ground. you will have to either switch your distibutor plug wires over to an Obd1 plug or get a obdo-0 to obd1 distributor adapter. you can buy the distributor adapter and the ecu jumper harness here:

http://www.rywire.com/sitob18c5_i.shtml

your jumper harness will come with instructions on which wres to run where. also your obd-0 engine harness will not plug into obd1 injectors. you must either bypass your resistor box and switch over the obd1 injector plugs to your engine harness, or run obd-0 injectors . I've never tried running obd-0 injectors so i cant give you much info on it, but i would reccommend the obd1 ones anyway- you can find more info on bypassing your resistor box by searching here or honda-tech.com finally you do know you must switch the vtec engine over to your si transmission right? good luck and use that search option

 

thank you so much for the help. this is all new to me, that means that your help is most appreciated.