Unfortunately after using Autometer gauges for awhile we have determined that their readability at night is less then optimal. To improve gauge readouts we decided to switch to Stewart-Warner gauge set. Although the overall size remained at 52mm (2-1/16″) the new design of the Stewart-Warner gauge trim ring allows for larger display area. New “lighting technology” is also supposed to improve night-time readouts. This gauge set includes Coolant Temperature Gauge and Boost Gauge.