Look over the Longacre gauges. They have both analog and digital versions. We went with the analog one with a large face. Don’t know how you’re going to verify that the gauge you purchase is going to read perfectly accurate. Let’s say that it reads 10.25 lbs with a known 10 psi supply. As long as it reads .25 high every time you use it and at every pressure, you’re golden. When you want to make a 2 lb change and the gauge accurately measures those 2 lbs, don’t think you can ask much more of the gauge. Get a gauge that only reads to 30 psi if you’re only going to use it for karting. Take care of the gauge by bouncing it around in a tool box or dropping it on the ground.