Transfer all existing sensors on the b16a to the gsr motor. Where you'll have trouble with this swap (marginally) is the intake manifold. GSR is vastly different. I've got a similar situation with my ls/vtec build, so I'm using the civic intake manifold on a gsr head. On my swap, I'm just dropping the existing obd0 sensors onto the engine. If I need any obd1 or obd2 stuff, though, I'll just get plug extensions off ebay and solder them in. Also.. here's a crazy thought.. why don't you just get an obd1 gsr motor - or even a b17a w/ a gsr crank (which IS (pretty much) a gsr motor)? If you do that, you'll only have to wire up the gsr air bypass junk on the intake manifold. The rest would be IDENTICAL. ECU and all. If you NEED the itr power, toss itr cams into the proposed b18c1 or b17a w/ gsr crank. Then, you've got yourself a poor man's itr.