Simply replace the oil filler cap with this gauge and you have instant access to the operating temperature of your engine’s oil. The gauge is knurled for easy installation/removal with no tools and is liquid filled to reduce vibration and thermal fluctuations. Fits 2001-2016 air cooled Triumph Bonneville, Thruxton, Scrambler, America and Speedmaster. Fits 2016+ liquid cooled Triumph Bonneville T100, T120, Street Twin, Thruxton 1200, Thruxton R, Street Cup, Speedmaster, Street Scrambler, Bobber