I did the chip swap, and that worked fine. Every function was preserved, and the MHz Programming goes waaay beyond the stock 35-50 megs.
Then I added the switch, and that seems to work ok, but when engaged up or down in makes a little electronic burp, ever so slight. Plus, the unit lost its 39.75, 41.25, and 47.25 MHz trap settings. They all come up reading too low in frequency.
Why? And, do I really need the switch?