There seems to be two ways to do this:

You can either hook the purge solenoid directly to the purge port on the main Nitrous solenoid, or you can use the blue adaptor piece in the Gen-X kit to install the purge solenoid off a sideport before the main nitrous solenoid. Which way should I do it? Thanks.

 

It should work either way but I found that if you use the adaptor you can place the purge solenoid somewhere else making it easier to run the purge line.