How to wire the power cord for MPGuino?

[OG VX]

Hello, as the topic states, I'm hoping to finish up my MPGuino install this weekend.

The power cord that powers the unit (with the A/C style connector to board).

I stripped the wiring loom off and I have:

- Center (thick) stranded wire. I'm assuming this is to constant power?

- Grounded strands that wrap/insulate around the center wire. I'm assuming I roll this together into solder it to a wire which will go to ground under the dash?

Am I getting this right?

Don't want to fry the board or the car.

Any help appreciated. Thank you!