Hi rapidfire ... nice to have another GSX 1400 owner here. You'll find lots of information about the TRE and the GSX 1400 at www.gsx1400.org
, the GSX 1400 owner's club in the UK.
Remove the panel on the left side of the bike, and look for the cable set with 3 cables. IIRC, one is brown and one is pink, but I may be wrong (I installed my TRE last year). If you have a TRE that's been commercially made (I got mine through the .ORG), it's a plug-and-play installation that takes about 5 minutes.