I am putting a 96 SOHC VTEC into an 89 CRX Si. I noticed that the VTEC solenoid has a single wire on a connector and a 2 pin sensor. I assume you feed the single wire with +12V to activate VTEC Is the other sensor for?

Also the 96 motor has a sensor at the cranks timing gear but the 89 does not is this sensor nessecary???

And last will the 96 clutch/pressure plate/flywheel work on the 89 Si tranny???
Thanks