Ground disconnect issue

[skip99]

Electrical question, i put a ground shutoff switch in the truck, the dakota gauges are ground isolated from the body, so, no issue, i can run a small ground the cutoff for the computers, but….on the radio, the grd wire is grounded tothe body of the radio which will ground to the dash, how can i wire it so i can have the constant 12v for the radio memory ? Justso you understand, everything is hot, i just remove grd from truck frame by switch, if i run a small grd around the switch to aloow radio memory, if i were to say accidently try and start or elect choke comes on with key i think it will try to seek grd through thr small jumper for radio…8 cant see where a diode would work,,any ideas? Kinda seems like i shoud just not worry about the radio orclock