The 52 mm Small Gauges developed by Farringdon fill a niche for Historic Motorsport where no small gauges with period faces have been available with modern stepper motor mechanisms and accurate electronic sensors. These instruments include engine saving warnings and tell-tales.
The images above show the types that are currently available. Bezels can be either black or chrome. All gauges have an eight way M8 connector fitted to the rear of the enclosure and are supplied with a mating connector with flying leads.
The pressure gauges use piezo-resistive pressure sensors that provide better than 1% accuracy over a wide range of temperatures. The sensors have a male 3/8 UNF port which connects to -3 fittings easily. Although hydraulic isolators can be used with mechanical gauges, an electrical connection is instrinsically safe for high pressure fuel systems such as those found with Lucas fuel injection systems on BDG, FVC and DFV engines. A industry standard Metripak connector is provided to connect the sensor to the gauge.
Temperature gauges are supplied with thermister based sensors embedded in a brass fitting designed to replace typical capillary sensors directly. An accuracy of better than 3% is obtained. These sensors have a long flying lead for ease of installation. As an alternative Bosch temperature sensors with a M12 x 1.5 thread can be provided.
All temperatures gauges have settable maximums over which a warning signal is generated. Similarly, pressure gauges have minimum settings below which warnings are provided. Warnings cause a bright blue LED behind the dial to light, as shown above. Warnings are set up using a magnetic wand on the instrument glass. This is possible while the gauges are installed in the dash - buttons are not necessary.