I just searched and the Hot oil light has to do with your transmission. Have you checked the fluid level lately, does it look dirty or smell burn't.
The neutral start switch is located inside the transmission on the Jeeps and it could be the problem with the starter not working properly if the other things don't work that I suggested.
My advise would take it to a transmission shop and not a Dealer to have the transmission check out if everything else checks out ok.
