Description
A hole with 85mm(3-3/8") dimension and 55mm(2-3/16") depth on dashboard or an extra gauge holder. Screw-mount style installation.Speed Ratio: 1-10 adjustable, You can press the back button to adjust it. Idle speed is typically 600-800rpm. Details refer to owner manual..Suitable for gasoline engine. Tachometer can get signal from engine, ignition coil, crankshaft sensor, or tacho sensor (be sold separately), etc..316 Stainless steel bezel with curved glass.1 year Warranty, 100% waterproof and anti-fogging protection