not trying to hyjack a thread, just trying to understand things better. ive been playing around with my timing meter and just cant get it set to my likings. i have a snap-on lumimag meter thats digital and uses the luminosity probe to time. theres two issues that i dont understand. 1st- what does a 20* offset mean, and 2nd- does neg on the meter mean atdc or btdc or does pos onn the meter mean atdc or btdc?
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