Installed Tachometer, now Ranger won't start!!!

I just installed a Sun Pro Mini Tachometer for my 2000 Ford Ranger 2.5l 5-speed. I followed the instructions and routed the green wire from the Tach to the Tan/yellow striped wire coming off of the PCM. I stripped the wires, twisted them all together and soldered them. I tried starting it but it just cranks and cranks and won't start, so it has to be an electrical problem since that's the only thing I messed with. I also don't know where to splice the white wire (to light up the Tach). Help!!!!