Features a 2 stage high RPM warning light that can also be used as a 2 stage shift light The LED backlight shows through the dial face Has stepper motor precision tach at an affordable price Get maximum RPM recall at the touch of a button Overall diameter measures 4.5" and has a 0-10,000 RPM limit Stepper motor techometers use a small electric motor to drive the pointer. It is more precise than the more common 'aircore' instruments whose accuracy can be affected by the windings. Many professional race teams - NASCAR, etc. – are switching to this style of tach for the improved accuracy and response. Maximum RPM recall - Just push the Recall button. High RPM Warning light - 2 stage - First warning can be set for just over your normal maximum RPM, the second stage at the redline. You get a warning of too many revs before you blow an engine. Can also be used as a 2 stage shift light. LED back light - Back light shows through the dial face PLUS the pointer is LED illuminated to make this the easiest tach to read - and super sharp looking too. Stepper motor precision tach at an affordable price. Brand: AccuTech SMi. Style: Stepper Motor. Range: 0-10K RPM. High RPM Warning Light: 2 stage. 4-1/2" Diameter. Face Color: Silver/Black. Bezel Color: Silver. White or Blue backlight. Pointer Color: Red LED illuminated.