CEL Help needed to pass emissions

[PrimeTimeSlime]

I swapped in a 328 motor about a year ago, and now it is time to pass emissions. I have gotten rid of all of the codes except one:

p0451- P0451 Evaporative Emission Control System Pressure Sensor Range/Performance"

I know this has to do with the fuel vapor purge valve (which is installed, but disconnected form the vent line when it started to collapse my gas tank). From what I understand, this sensor does not exist on the 318ti, but it does on the 328 that I got the engine from. Has anyone figured out a way to fool the computer or hook up the sensor?

Would really appreciate it if someone who has dealt with this one would chime in.