timeing advance?

My understanding is you change a jumper wire to select the timing curve on the Jag. Or maybe a dip switch...
 
It has two sets of jumpers, 0+1, 1+2, or none. One will adjust the curvature of your ignition sequence, the other will adjust initial timing (but it will still be on a curve). You'll have to check that site, but jumper A is the initial timing
 
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