if the PFC has been reset to defaults the boost control kit is on by default, which means when you start the car, if you dont have the boost control kit, the engine check light stays on
so if you dont have the boost control kit and your PFC has been reset then your engine check light will remain on
the PFC has NVRAM which means the tune is only lost if the PFC requests to erase the NVRAM, kinda like flash ram
so with no power for years or sparks etc the NVRAM can retain its tune / details
when i fried my PFC and repaired it and booted the car up the PFC returned back to where it was (ie on the same monitor screen) and tune was still present
when knock is displayed under MONITOR, 1 CHANNEL, KNOCK you will get a bar graph, press UP displays top score in digital read out. Press RIGHT to erase the top score