hummer vss and reverse

i've got a 2001 hummer h1 in the bay, if anyone has experience besides what the websites say for vss and reverse, it would be of great help, I can get reverse at the light in the back, but was hoping for something a bit easier

Thanks in advanced

paul

paul

 the easiest way i have found to get to the vss wire is to remove the speedometer and you will find a purple wire,

I have always used a white wire behind the instrument cluster on new platform GM vehicles, there are 2 sometimes 3, I usually just tap them all put the cluster back in and road test each wire with a DMM, as for the reverse wire, you should be able to locate it under the column, don't remember the color right off hand