iirc i think it is only retarded with the TT module and not the regular 2GCDFIS mod so shouldn't apply here.

 

if your using any sort of reluctor adapter ( GM/bosch or j105 or j109 ) then you have to check the timing when done,, as wiring the trigger polarity backwards will shift the timing,, and make it retard with revs

you have to also be aware that the series 1 electronic dizzy ( j105 ) has its reluctor vanes in opposite direction to those in the s2/3 dizzy

this does have implications for the trigger polarity,, as if you follow a diagram made for the s1 dizzy for the s2/3 dizzy you will have a timing shift and retard with revs

setup properly you test for idle and for about 25 BTDC at 4000 rpm,, by 8000 rpm it should have added about 2 degrees ( 27 BTDC )
if so,, you have all the polarity correct

 

and for those wanting to know what GM product i use.. BIM024 and HEC715 or 716
... its all on the ausrotary sticky ,, its already documented that its not avail in the US, and you have a different equiv