Ames has a picture of the vacume wiring in their parts catalog. I don't know if your going for just function or a factory look but you can bypass the whole Thermo switch. It was just used for emissions. The 68 used a push pull vacume advance. This is why you have a 5 port switch. In 69 they went to a 3 port switch. This is what I'm going to use. Very few people will know it wasn't factory.
