Hey what's up every one this is my first time using a forum soo if you know a link to what can help me with my problem I would appreciate it if y'all can send it to me

Ok so basicly I got an 92 eg hatch dx. It was automatic converted too manual it has stock harness I have the obd1 b18b1 on it with a gsr trans. I have a stock p75 ecu and brand new dizzy full tune up. Basicly that's the info on the car.

Ok now the problem is that when I try to launch my rpms all the way too 7500 where it should. Redline it throws me back at 6000 idk why its not letting me redline it at 7500 can it be that the primary o2 sensor is not on?