Yes, hook up is the same. I can't remember either but I think it is the negative side. I'd do the same as mentioned. Try it, if it doesn't work, change it. Also, you may need to configure your tach for 4 cyl if I remember correctly. Yes, I know, that sounds weird. Trust me, I read it on this board today. If you have the Mopar TFI, your tach needs to be set for 4 cyl. Do a search on Tach. You can read for yourself. HTH
2004 Rubicon, 6" lift, 35s, winch, hard top, full doors, bumpers, tire carrier and rock sliders.