Autometer's In-Dash tachometers are available in two different sizes the oversized 5-inch and the smaller 3 3/8 inch. The 5-inch tachometers come in Dual Range with memory, Single Range with memory and a standard electric tach. The 3 3/8 is only available in a standard single range electric tachometer. All the in dash tachs have an RPM range of 10,000 RPMs. Operates on 4, 6, or 8 cylinder engines with points, electronic, and most 12-volt high performance racing ignitions.