Interior fusebox- Spare ACC position?

[Jak_11]

I’m currently wiring up some retrofit interior lights, and the main control box that links everything I need to connect to the interior fuse box. Obviously I’m only wanting this to be live only when the engine is running (or even better when the headlights are on), so wondered weather anyone had any experience with a spare ACC slot in the fuse box I could use (and obviously not wanting to ****** up the rest of the vehicle electrical system )

Thanks for any advice!

Below is the live and ground that is on the control box wiring loom.

 

[JoMP]

I used this one for a dash cam, it is powered only at ACC and a few minutes after engine off.
You could use this:

 

[DJAlix]

Grab a £10 multimeter from Amazon / eBay and get prob’ing. Safest way and a good item to have in the toolbox.