Advice on harness

[fxny12004]

So after talking to a guy ( that i trust) at my steal-ership he showed me where the easiest way to tap into the speed sensor wire is (in his opinion), after an extensive search through the manual. He said to tap into the speed sensor wire going into the ECM (the computer, A21, Pin 8) Its a violet/white wire.

Question is...is this right and or safe? I really dont want to mess up the speed sensor wire or the ecm for that matter if you know what i mean. I already pulled some 18 gauge wire from the passenger cabin to the engine compartment to clamp it with a tap to bring back to the pioneer. Which brings me to my other question: the VSS wire seems to be gauge 22, and i went to three automotive stores AND walmart and they dont sell wire of that gauge. Is it ok if use the 18 gauge? Any consequences or issues in the future? if this wire is gonna cause me more issues, i rather not use it and not connect vss to the navi.

Also, i am planning on finishing the installation tomorrow morning and wanted to confirm some wire colors. I am all set with the speaker wires, i just wasnt sure about some of them since the color guide posted here is somewhat vague for us noobs


So..just want to make sure i get these straight before i start clamping away with the taps:

Radio 12v blue + radio harness : this wire goes to the terminal always supplied with power regardless if ignition switch position

Radio Ignition gray + radio harness this wire goes to the electric terminal controlled by ignition

Radio Illumination green + radio harness this goes to the lightting switch terminal (will let the pioneer unit know when my headlights are on and therefore switch color scheme for night)

Did i get these right?

i know im a total noob and i appreciate all the help i've already received so praise YARISWORLD


thanks dudes!