I used that set up but bought the switches for a gm turbo350 for $8 ea one 35lb and one 40lb at the trans parts store. That way you can set up the convertor and od to come in at different times.The vacuum switch came from a mid 80s caprice. $15. Parts house parts for plumbing. Followed PATC 's install instructions. worked for the 2 years I had the truck and really helped the mileage considering is was running a 408 stroker. Ignition fired the vacuum switch that fed the center post on the trans plug and one wire to each pressure switch from the outer two trans plug terminals and a ground form each P switch. Super simple set up.

wow I just looked up the vacuum switch and the price is up to $60+. PATC kit may not be a bad deal.