forcefedh22

I recently turbocharged my 91 accord. It has a h22 in it and the map sensor I am using is in the little black box on the firewall. The reason I didn't use the one on the trottle body is because it was easier to use the one in the box because i am using an obd1 ecu. Anyway I put it all together yesterday and drove it today and it ran like crap. Does anyone know what i can do to keep the map sensor from reading boost???? I tried using check valves but that didn't work. I was thinking about a missing link but I've only seen them for obd2. Anyone know what I can do??