Parking lamp fuse and ground source?

AutoEuphoria

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'08 CPW Mazdaspeed 3
I am trying to figure out how to wire the Prosport boost gauge I bought. I read the threads detailing installs, but I'm still confused, and the directions that come with the gauge are not too helpful.

The directions say this:

Red wire - constant 12V source
Black wire - ground
White wire - Accessory
Orange wire - Parking Lamps

From reading the walkthroughs, I've decided to use Fuse #F75 for the 12V source (Passenger Door Locks), and Fuse #F43 for the white (Accessory, Cigar). What fuse should I hook the orange wire to, and where do I find a good ground for the black wire?

Thank you!
 
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