s14 with s14 sr20 wont stay running, and gauges dont work....helppp

[Dilbert11]

ok, I have and 1997 s14 with a zenki sr20det with 480cc injector z 32 maf with stock ecu and a untuned safc 2. The car only starts if i put it on a slow charge for at least 2 days. when it starts it will idle for a few seconds then die out i can keep it running if i keep revving it up high soon as i let off of it it dies. I've tested the alternator its fine I have also checked the cas took it out and spun it injectors click fine. None of the gauges work but all the lights come on as normal, the safc 2 is reading volts and throttle position but it is not getting a tach signal. I also have the conversion harness from wiring specialities, and new fuel pump.

Need help to know where to go from here anything i can check, how to know if you have a bad ecu or could it be a bad sensor, or could the timing cause this ??