I really like the scan gauge. For the coolant temp, I really never look at the cluster gauge, only the scangauge cuz then I know exactly what temp it is, not somewhere between H and C. But for some reason with my Ranger, it will freeze and turn off randomly and then come back on randomly. If I try to turn it on after it freezes, the gauges are still frozen and after about a minute if turns back off. Don't know why and it bugs me quite a bit. Never did that in my last car, a Subaru Legacy.
1996 Ford Ranger STX 4x4 4.0L
1983 Honda Shadow VT750C