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Hi peoples havent had much luck with google so reaching out here for some answers hopefully. Putting an S15 motor and box into an S13 shell, have swapped the S15 wiring harness and computer etc over and she cranks over ok and has spark ok but wont fire. Checked injectors and theres 12 volts on one terminal, hooked up a noid light and theres no pulse at all. This setup is running a Haltech Platinum sports 1000 computer, am I right in thinking if its got an aftermarket computer then NATS would have been disabled/bypassed if it had it with the factory computer?? Engine box and computer etc came out of a JDM model, I didnt get to remove it from the original car so doing things a little bit blind, also the guys that pulled it all out of the S15 cut the loom that goes to the back of the instrument cluster, I vaguley recall reading somewhere that the injection system needs a signal from the tacho to tell it the motor is turning over, could the cut wires be causing the problem of no injector pulse?? I was originally thinking of wiring in the old s13 cluster and only using things like fuel gauge and tacho and having aftermarket gauges for the rest as I cant see an easy way to get the S15 cluster to fit but was thinking I might have to solder the old plugs back onto the loom and just get the S15 cluster sitting in there somehow if that is going to cure the lack of injector pulse problem?? Thanks in advance for suggestions and help