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A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.
An optional tachometer was available, which would be located in the third pod, and an optional clock occupied the fourth pod. Ford offered many upholstery options, including a knitted vinyl option, called "comfortweave." This unique option allowed the vinyl to "breathe" unlike conventional vinyl, offering more comfort in hot weather.
By 1961 the company began to sell products with their own Spark-O-Matic brand name. The product line included aftermarket car transmission shifters and related automotive accessories such as tachometers and oil gauges. In 1968 the company branched into car audio accessories with a line of FM car radios, speakers and related accessories.
Founded at Bradford by Edward Exley about 1920, the products were initially locomotives, in live steam, clockwork and electrically powered, in gauges 0 and 1, which were made to order. By the 1930s, 0 gauge coaches had joined the range of products, probably Exley's most successful line.
The tach timer is usually used to schedule engine maintenance, although it is just an approximation of "Time in service" which is used to time and schedule aircraft maintenance. Time in service is defined in 14 CFR 1.1 [ 2 ] as the actual time in the air, whereas tach time measures engine revolutions, which would still count time on the ground ...
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