there is plug in difference yes. with the pigtail its not a problem. ive found that the cold start switch seems to be the same on almost any toyota from the 80's and early 90's. it seems to be a generic densu part but im not 100% on that, as i dont know if the temp for them to stop is different. all i know is with the pigtail my supra ran a cold start switch from a 4ag.