I am running a Performance electronics ECU in my CRX with all the OEM sensors, no customs sensor required to start. You will need to make a conversion harness. Performance electronics made a custom harness to connect to the OEM OBD0 main harness.
The math puts this system at a lower cost than an AEM ECU with all the options, have also tested with most Honda ECU cases and it can fit without modifying the case (ST* legal) when the PE main board is removed from their case.
Let me know if you have any questions, I can send you pictures of my install.