If you want to monitor pressure with your 180mm pulley, you should probably get the Greddy pressure sensor. Failing that, you could use the TPS as the load refferance. I did that for ages on AFM 4AGZE. It's a slightly dodgey method, but it's pretty reasonable on an SC engine, but it should never be done on a turbo'd engine.
Word around the forum is that the knock sensor isn't particularly accurate on the 4AGZEs. I don't use it myself.
I'd be much more inclined to use the IAT sensor. Especially as you have the MAP sensed ECU. If you fit a more effective intercooler or water injection, it will allow you to use the IAT maps to change ignition timing and fuel.
Hope that helps.