2003 Pontiac Vibe Install Help

Hello all, thanks for all the help I have searched up thus far... just a question on the "tach wire".... I know it is a black wire in the ECU under/behind glove box... but I have read that it is in the left and it is in the right, well, if you are looking up at the ECU from under the dash "ie: laying on your back, which side is it on, the plug closest to the door or the plug closest tot he radio? 

Also, since the Vibe has auto interior light with unlock, I was going to hook up my CS-2011 RS IV to output to my light for illuminated entry outside at night.  Has anyone tried to hook into the "Twilight Sensor" on the dash.  I wanted to hook into that with a relay so when I unlock the doors in the daytime only the parking lights would flash "through the pk light output" and at night the pk lights would still flash, but through relays my fogs and backup lamps could light up, but only when the photo sensor completes the circuit due to darkness.  Just curious if anyone has tried this yet...  Thanks a ton in advance!!!!