The Micro Dynamics shift light is simple to install and is fully user settable to give the driver a visual indication of the optimum engine revs at which to change gear.Suitable for engines of 1-8 cylinders and with most negative earth ignition systems, including CDI ignition with a tachometer output. Provides a clear visual reference of optimum gear shift RPMCompatible with most negative earth ignition systemsEasy to set upThe shift light is user adjustable to any RPM between: 1,000 to 40,000 sparks / minute (e.g. 500 RPM to 20,000 RPM on 4 cylinder engines).The system comprises of a control box, which once set can be hidden out of sight, and a remotely mounted ultra bright 10mm LED complete with mounting bezel. The light requires a 14mm hole for mounting.The shift light is supplied in a rugged reusable hard plastic case.