Dive computers may be wrist-mounted or fitted to a console with the submersible pressure gauge. The Terraplane did not have an ammeter or an oil pressure gauge. It uses the same boiler/burner unit as the SP6 (fitted with a pressure gauge). They may have a fuel gauge and a pressure gauge. The Turbo also benefitted from an LCD boost pressure gauge. The spring balance valve also acted as a pressure gauge. There is a suit pressure gauge on the left wrist. As an example, a manual process may be used for calibration of a pressure gauge. This is usually monitored by using a submersible pressure gauge on each cylinder. The inlet pressure gauge will indicate this pressure. This pressure is then transmitted to a hydraulic pressure gauge via a high pressure hose. The outlet pressure gauge will indicate this pressure. Instrumentation included an oil pressure gauge, an ammeter and an electric clock. It can be verified experimentally using a pressure gauge and a variable volume container. The 1957 Chevrolets did not have an oil pressure gauge or a voltmeter.