Proform 850 dialing it in closer

If the LM-2 i can choose from picking up the spark signal from the leading or the trailing edge of the spark spike.
I don't remember what its set at right now.
I also have a 10 turn potentiometer on the tach signal going to the LM-2. instructions say run counter clock wise until you loose tach signal then turn to the right until it just starts to read.
I turned that thing all over the place when i was chasing the o2 freeze up. need to fine tune it again.