You probably have an OBD1 h22a from a 93-95 prelude vtec. You have obd2. They started it in 1996 (4th gen) and up into the 5th gen. Someone must have given you a 4th gen prelude obd1 h22a. Call a honda dealership and have them look up the engine code and they should be able to tell you what year its from (95 or under is obd1). Or go to
www.PreludePower.com and ask them in the 5th gen forum. GREAT place to go when you need to talk to knowledgable people.