Thanks. I was playing with the custom ranges today and was able to get a good stable right side up pattern on 2000 chev 6.0L and 98 Linc with COP.

Is there a way to invert the pattern or switch polarity on the 2202 scope?
I would like to use it for secondary ignition but pattern is upside down. If I reverse probe leads the pattern gets deformed and erratic. Can it be done with custom ranges?