Just got done swapping the truggy motor into the 'Burb, and while tightening the thermostat housing bolt, my buddy broke the ported vacuum switch right off the manifold. It sends vacuum to the EGR valve telling it to open at a given temp. So I'm needing a new one. Went to Napa to get it, and find that are two different "colors". Purple and green. Green opens at 180*, purple at 130*. The one that my buddy broke was the purple 130* one. Now I'm assuming this is the correct one, but for safteys sake and the fact that the po could have done anything....I want to confirm this. Does anyone know for sure? Dorian maybe? He seems to know alot of obscure stuff like this. I gotta get it all set-up and ready for a smog test. I gotta have everything perfect as I live in good old Kalifornia.