Wow DADS50, your post makes it sound like the Runtz is optional. I called Jeff at Bowtiebits this morning and he assured me that that gauge is 12v since he tested and marked it 12v before it left the shop, I still have to do my rechecks. Was going to do it after work today but the wind chill is 28 degs. It was 81 degs just two days ago. This weather is crazy. Will keep all posted on the results, thanks again HUGH