Glitch adjusting question

mpfi3100

Registered
Okay, I did a search and didn't find what i'm sure is a simple answer.

I'm feeling totally blonde on this one and I KNOW I should know this.

I got the glitch inverter to fix my flickering rear neon on my 1998 raggedy lincoln. Installed it and it works but it needs to be adjusted.

I see the TINY screw but one thing that is not in the directions... when you adjust it, do you need to do it with the parking lights on, or the brake lights on? I know I should know this but it is escaping me at this time.
 
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