say yo want to check or set for 33 degrees advance. dial the light until it reads 33 btdc. look at the balancer and when the 0 line on the balncer lines up with the 0 mark on the timing chain cover, you are at 33 degrees advance.

if the 10 btdc mark on the balancer lines up with the 0 mark on the cover, youre at 43 degrees advance