this is my setup. 97 rs tegra. has a b20 block and i just purchased a 94 gsr head.
what ecu do i need to get.

 

The ECU I would use is a chipped P28. Those don't require a knock sensor like the GSR or the B16a ECU does (assuming you have a b20b block). Unless you're using a b20Z block, which has a bung for the knock sensor. Either way, those are the ECUs you'll need. Or you can "ghetto rig" it and use the LS ECU and just wire the VTEC to a RPM activated switch. It's all on personal preference.