I am overwhelemd on this entire wiring thing. No idea what grounding really even is, or tapping wires for speed senor, or behind the HVAC. Any help, please!

-dan

if your that confused, maybe you should have it professionally installed

06 or 07?

click on my sig for my pics of my install

but if you dont know what tapping or grounding is then you may want to get it professionally installed or a friend who has some knowledge on how to install stereo equipment

im guessing the wiring is the same as an xa, if so:

you should have a third plug on the radio harness than isnt used on base model factory decks..the vss wire is on that plug and is purple/white

Look for the spare wire harness used by the stock unit and not used anymore and use the 3rd Pin (I Believe) - Yellow wire. That's VSS. There is also a VSS in the HVAC plug, but I have found the other once much easier to splice into. Just connected mine up in my 07 tC several days ago after finding the wiring diagrams.