Precision accuracy for 4, 6, or 8 cylinder engines stuffed into a compact 2 1/16" housing. It's fully back lighted and nestles snuggly in your cars gauge cluster. The VDO 8,000 RPM Mini Tachometer is easy to install and requires only one engine wire, one 12 volt feed wire, and a ground connection. A VDO Mini Tach will provide you with the data you need to tune and drive a high performance engine.