Frank,

The 1168 works with 12v negative ground 235/261 (and others). Pertronix has it incorrectly identified and 54-62 (it should be identified as 55-2nd through 62).

I think there are still two versions of the 6v 1167, one for 6v negative ground and one for 6v positive ground.

Yes, it does make a difference.

Tim