Before I start splicing some wires I just want to be sure I'm connecting to the correct locations and such so I don't screw up and who better to ask than my good friends at audizine.

First part I have the sender which needs
12v
Ground
Gauge

Boost gauge needs
12v
Ground
Sender
Engine accessory
Head light switch (switched power to switch between blue and red backlight)

I was thinking for the 12v power connecting to the ignition wire under the kick panel.
I also want to connect the ground under there where Po hooked up floor leds.
The one for engine accessory I'm a little confused on, was thinking any 12v switched power should be good please correct if I'm wrong.
For the headlight switched I'm thinking of patching into one of the fog light switches so I can have blue in the day and switch to red at night to match the rest of the illuminated buttons etc.

Any problems or does this sound good?