Because the overheating point varies from application to application, we do not mark a "redline" on any of our gauges. What we do have available is a number of gauge lines that have a programmable warning that you can set to whatever point you like. The warnings will vary from an LED on the face of the gauge (such as the Ultra Lite Peak/Warn or Sport Comp II Pro Control gauges) to a full face color changing warning (as in the Elite, Competition and Nexus lines). The added benefit to this style of gauges is they have a peak memory function which allows you to see the highest point reached during period of time. Hope this helps, please let me know if I can be of further assistance.

Best regards,

Joseph Mills
Auto Meter Products, Inc.