Another alternative is to get your existing sohc vtec obd1 ecu socketed/chipped and then tuned to match the new b18c setup. Once chipped the ecu can be programmed to match the existing sensors which the ecu supports which is the same as those on your sohc vtec engine. Which means you do not have to make any changes to your existing loom if you do not want to, but at the sacrifice of using the single wire O2 sensor vs the 4-wire on the b18c and also the knock sensor and vtec pressure oil switch if used on the b18c engine. These additional sensor can be disabled in in the program and If tuned properly there will be no difference in performance.