Industry standard 2-1/16" diameter gauges from Dakota Digital feature a non-glare, high-brightness, vacuum fluorescent graphic displays with no engraved annunciators, for a black out effect when off Choose from a variety of mounting options: flush mounted into a tank, bar mounted into a cup or bracket You get the durability of machined aluminum housings and the brilliant look of chrome bezels All come with manufacturer's 2-year warranty. Speedometer sending units are sold separately Readouts display rpm with a 0-18,000 rpm range with 10 rpm resolution below 10,000 rpms and 100 rpm resolution above 10,000 rpms High rpm recall. Adjustable from 1-15 cylinders Mounts in a 2-1/16" opening