Probably time to re-hash what this is all about.
"F" is my high-speed fan override. Rather than running a wire through the firewall to ground the relay, I'm going straight to the PCM (which is in the cabin) for this.
"160" is for when I'm running the 160° thermostat. Mine is a higher flow rate than normal (wider when open), and it'* bypass-drilled as well. The 160° mode works like the ZZP e-stat, and adds about 20° to the temperature being sent to the PCM so I don't run in fuel enrichment mode all the time.
"ADV" is a bypass switch to enable the potentiometer (dial), allowing it to control timing advance. This is VERY dangerous considering the high boost levels I'm running now. It gives me the ability to advance the timing as far as the PCM will allow which is HIGHER than a stock PCM to answer Blazin'* earlier question, since I'm running the Jet Stage 2 PCM. This feature is more for testing than anything.