I have tried editing the mini panel.cfg that is in the ACFT/default/panels folder with no luck yet.
I have manually added the mini panel to my acft. in their own panel.cfg and have been playing with that. So far, no luck.
I have however added the radar to most of my acft. by using just a correctly sized "No Bitmap" panel and placing the gauge on top of that.
But, for my final solution, for me, I added an old bit map that I redid. Use to use this bitmap for my older Nav. Panels I made for CFS2.
Unfortunately, you have to add this to each acft. of your choice. But once added it is just a simple matter of placing the bit map in the panel folder and then copy and paste a few lines. 8-)

Systemax Sabre Ultimate gaming rig.
I got all the goodies and all the power I need to run anything thrown at me for the next two months!