Tachometer Gauges are used to measure the precise rotation speed of a motor's shaft or disk. They typically display RPM on an analogue dial, but more and more gauge manufacturers are beginning to make use of digital displays as well. Analogue gauges will have a redzone, where speeds above the maximum determined to be safe are displayed. This is where the expression of a redlining engine stems from. This term is used to describe the over revving of an engine past the safe limit.
More on Tachometer Gauges - Diesel Trucks & More
Tachometer gauges will display the rotational rate of the crankshaft of your engine, and are marked so as to communicate to the driver what a safe range of rotational speeds really is. These specifications and design features will aide you in making use of the correct throttle and gear settings for whatever environment you find yourself in. Prolonged use of the crankshaft at high speeds is one of the ways that you can cause permanent damage in the form of excessive wear or engine failure to your vehicle. These worst case scenarios are usually symptomatic of things that a tachometer can tell you about beforehand, like inadequate lubrication or overheating.
