Some help with fitting Water injection??

[Lum]

I am currently helping a friend fit WI to his FD and we could do with a little advice please?
We are fitting a Aquamist HFS6 kit & are having some trouble wiring it in:xconfused
Am i right in thinking we need to wire it to the MAP sensor output wire (0-5v) rather than the input wire?
Does anybody know which wire this is at the ECU? or have a ECU pinout diagram so i can determine which wire it is?
The car is a 98 RS-R
Thanks:Thumbsup!