Since 1957, Autometer Has Set The Standard In Performance, Accuracy And Durability With Their Legendary Tachometers. The Absolute Pinnacle Of Engineering And Technology, Its No Wonder Autometer Can Lay Claim To More Motorsports Victories Than Every Other Gauge Manufacturer Combined. The Patented Air Core Meter Movement, Wound In House To Exacting Standards, Can Move The Needle From 0 - 10,000 Rpm In 333 Milliseconds. An Ultra Bright Shift Light Guarantees You Hit Your Shifts Perfectly, Every Time. An Inaugural Inductee To The Hot Rod Speed Parts Hall Of Fame, No Other Tachometer On The Market Has Had Anything Approaching Its Impact On Professional Racing. Built For A Lifetime Of Service Under The Harshest Conditions, This Is The No Compromise Tach For No Compromise Builds. When You" Re Ready For The Best, There Isnt Another Choice. Officially Licensed Gm Product.