I have a 2003 Tahoe with Bose. I am installing an AVIC-D3 and have all neccesary adapters (GMOS-04 mainly). Just a few quick questions. Can someone explain the VSS at the radio? I know there is a VSS in the engine compartment, but is there a VSS wire at the radio, and if so which is it? also, where is the best to pull 12V+ battery (how much current will all this stuff draw) and where is the easiest spot to tap reverse signal power? i am goin to install a 200W amp for a subwoofer. Can i just tap one of the fuse boxes or should i run from the battery? Thanks in advance!