I had a little trouble with the Arlen Ness. First, at the edge of my Rocker box covers where the bolts go, its not level. There's about a 30° contour/angle. If you just bolt up the gauge it will be at an angle, pointing down. So, I took a Dremmel and cut a couple of chrome Spacers I had which were just small enough to go down into the rocker box bolt bolt slots. The spacers were cut just high enough to clear the top of the rocker boxes and I was able to bolt up the gauge without the tilt. The other problem I ran into was that the oil pressure line that came with the gauge was way too long. I eventually found a company in Germany that made the correct length line for our engines. I think if you (anyone) searches online you can buy different versions of the Arlen Ness kit, with the correct line. It line length may be listed in millimeters but the conversion is about 13". I really like the style on the Ness gauge as well as the quality of the gauge. I spent a few minutes yesterday trying to find out who actually makes the gauge that comes with the Arlen Ness kit. I thought if I could find out who made it I could see if they manufactured other gauges as well. If so, these would make a really nice dual setup. However, if you look at the face on the gauge you see an (A), logo...so it looks like Arlen Ness had these made specifically for them.