I get a vacuum switch from a late 80,s van & a 2 prong oil pressure switch used for chokes on late 70,s chevs. Put the oil switch in the 4th gear pressure outlet. Hook the vacuum to ported vacuum on the carb. Wire it all together from a acess. outlet on the fuse panel. Some trans. dont have a taped hole for the pressure outlet. I,m not shure how to do it then but there is a way from inside the trans.
