Used to upgrade 1G-3G on my 76 f-250. It works fine now my truck is 14.5v at idle with the headlights and wipers on! The only reason I gave it 4 stars is because one of the coils was damaged. The box wasn't damaged so I have to assume it happened at the factory before packing. But I was in a bind and needed my truck so I epoxidized the damage and called it good. I had to remove a small amount of material from the back of the case to get it to fit, so I think I've voided my warranty. hope it lasts