Kendel,
Sorry after re-reading your post, you have a MK12 and I have a MK-12D, the "D" makes a big difference.
On my radio the adjust knob contacts are getting a little wonky. When I tune, it randomly skips a few clicks, and it is getting worse... Anyways I thought I could use it for a switch since Narco is gone for good, but the models are very different.
Thanks for the offer,
Tim in Mass