Hi Joe,
Time to head to a reputable avionics shop and get guidance. I’m not sure what kind of a budget you’re on but getting a modern waas/gps should be under consideration. A used Garmin 430 or something newer would be appropriate. Also, if the king radio is an old kx-170 and you’re on a budget, you can install a new plug and play mx-170 and get modern digital performance without any wiring or panel teardown. Best to go over your options with your radio shop.
Keep us informed,
Scott Sherer
N344TB




