i am using a z6 for my 90 cRX SI. i heard of msd rpm activator switches but they are so expensive.. is there any other way of activating vtec using my 90 SI ecu? also where would the oil pressure wire from the vtec solenoid go to on my 90SI ecu?

 

you can jerry rig it but WHY? just save up its worth it to buy a switch if you dont do it right and get the ECU and harness.

 

You can't wire in the oil pressure switch into the PM6. The PM6 doesn't have the ability to activate VTEC from the factory. Check out http://zdyne.com for an easy solution. You can also use a PR3 or PW0 ecu to run your motor, or convert to OBD1 using a P28 ecu and a OBD0 to OBD1 conversion harness (IM Blown90hatch for one).

 

I'm going to use a summit racing rpm activation switch its a bit cheaper than the msd.