I just bought an AVIC-X920BT and I don't want to spend another $130 on a wiring harness. does anyone have some tips for wiring this thing up. I have a couple questions about installing the Pioneer AVIC 920bt, mostly wire related. Hoping someone who has done this can help me out.

1) Where's the best location to tie into constant & switched power?

2) Do I need to connect the blue/white wire (auto antenna relay control terminal)?

3) Where do I connect the pink wire (car speed signal input)?

4) Where do I connect the violet wire (reverse-gear signal input)?

Lots of questions I know, any help would be appreciated. Thanks guys!