Tonight i noticed my temp sensor and my oil pressure sensor gauges are not working. my van is a 97 with a 3.9l v6. the needles on the gauges stay stationary, first i noticed the temp sensor was reading low so i shut the van off to see if they would move and they didn't. i'm guessing that this is where the needles rest when the van is shut off. where should i start looking to fix this problem? has anyone else had this happen? Thanks