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Charlie,
Are you sure the B16 is OBD1? 97 Del Sol's came with B16's from the factory, running a P30 ECU but are OBD2a. I'll assume you are sure it's OBD1.
The best way to go about that swap is to pull the wire harness off of your 2000 HX, and put it onto the B16. Some plugs will line up, others wont. The plugs that wont reach, add more wire to extend them. For plugs that are a different style, you have 2 options. You can clip the plug off of your HX harness and solder on the plug from the B16 harness or vice versa. The only thing that might give you trouble is the O2 sensor. I believe the are a 5 or 7 wire O2 on the HX while the B16 uses a 4 wire. You'll need to check a service manual to figure out which wire is what, and put the 4 wire plug on the harness.
If the ECU is OBD 1 and you use your 2000 HX wire harness, then you need to get an OBD2b -> OBD1 jumper harness from someplace like rywire.com.
I hope this helps.
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