P2J A2J? Never heard of that before. A quick google suggests that its for D15Z6. So it can work on your D15 single vtec but for 3 stage you'll need a P2J ECU.
If its a manual OBD2a you'll need P2J-003. Its very rare and you may need to search a bit.
With manual OBD2b you'll plug P2J-J11.
All other P2Js (like P2J-J62 that you'll find most abundant) are autos. They will work for you but not in the best way.
- P08 is for D15B single vtec to be very specific.