The Pro-control series has all the features of the normal Stack 52mm gauges, plus peak "tell-tale" memory recall. Programmable maximum and minimum full-dial alarm warnings. Configurable full dial alarm warning colour (this allows the user to chose from one of seven different colours for the alarm warning. This means that as soon as an alarm level is exceeded, the full dial face changes colour, and if the level exceeds the alarm set point by more than 10%, the dial face flashes rapidly to further alert the driver). Configurable Pro-control output for activating accesseries - eg. fans, pumps, audible alarms, lamps, ignition kill etc (requires relay). Temperature gauges have a built-in "fan contoller". 0-5 Volt analogue output for data logger or ECU. Backlight can also be configured (white, red, yellow, green, blue, purple and turquoise) - allows user to set optimum colour for maximum visibility and readability of gauge, day and night (or to match clocks of car). Black dial face when powered off. All gauges come complete with wiring harness and associated solid state sensor.