Just in case someone might be interested in installing a oil pressure gauge on there JK 3.8 I found a easy place to get to for the oil pressure sender. It's on the left side of the block between the timing case and motor mount. If I remember it's a 1/4 NPT plug and be sure to have a oil pan under to catch the oil that comes out when removing the plug. The picture of the location isn't the greatest but you should be able to see it easy when under there.