Sierra International 68399P Tachometer Sierra 68399P 3 inch Before ordering, please verify this is the correct part for your application. For assistance, please call sierra's Tech support at 1-877-663-8396 All sierra parts qualify for and are Covered under sierra's industry leading customer satisfaction Warranty Scratch-resistant domed glass lens Perimeter lighting for excellent readability at night U.S. and metric scales, with ISO symbols, where appropriate