one is a vac input and the exit you runing the vac line threw the zex control box

Engine must have a vacuum ported fuel pressure regulator
Throttle position sensor voltage must pass the following test:
Locate the T.P.S. (usually directly across from throttle linkage)
Turn ignition to on position (do not start engine)
Using a digital voltmeter, check each wire for a low voltage reading of approximately 1 volt.
Only one wire should have this low voltage with the throttle closed
While on that same wire, open the throttle completely and check the voltage reading
If your voltage reads 4.2 volts or higher, you are ready to install your ZEX nitrous kit
also try going to http://www.zex.com/