These instruments were developed by SO-CAL Speed Shop. The mechanical 3-3/8-inch 200 mph speedo, electric oil pressure gauge, electric water temperature gauge, volt meter and electric fuel gauge can be purchased as a set or sold individually. (see below related products.) Auxiliary gauges are all 2-1/16-inch diameter but are referred to as 2-inch A matching 3-3/8-inch 10,000 RPM tachometer is also available. All instruments have black faces with a small SO-CAL logo, chrome bezels and domed glass.Insrument Panel Dimensions 16 inches wide (5-1/2-inches high).