I am new to supras. I did a 1jz swap on my 1990 supra. Here my problem I wired everything up correclty that car starts and idles fine with no check engine lights. ( car previously non turbo) My tach dont work. Two is when i rev it even holding it at WOT it revs to 2500 and drops to 500 and goes backup to 2500 and drps back to 500. Its idles fine. I check fuel pump and its good. I check the injector signal and the computer is cutting the signal at 2500!!! Why is this? When i spray brake cleaner in intake the car will rev fine. My charge pipe is not connected. Could that be the problem . My harness is original and is not ectended. Please help. I am using and automatic ECU but I get no check engine lights. Someone please call me to help me. 954 548 7928 Cell