I've built my first jeep from the ground up. BUT that was many, many years ago. Back when you carried extra jets for the carburetor when you went to the mountains. Also gapped the points with a match book cover. Those were the days - yah - right. At any rate humor the old guy. The last vehicle I bought was my 2007 Rubicon. I have no idea what DSG or ESS are. Please give me a simple explanation as to what they are.