https://www.amazon.com/PAC-SWI-PS-In.../dp/B001EAWNVY

I used the PAC-SWI and retained the use of my stereo controls. You need to make sure that the new headunit has a wired remote plug in the back. 99% of new headunits will have this feature by default. The only other step was splicing into one wire on the factory harness with The PAC interface. The unit self programmed for me and installed in less than 15 minutes.