Abstract: A bar-type tachometer for indicating the speed of an engine and for providing a warning signal when the engine deviates from a predetermined, desired speed such as the desired idle speed>, In this way, even though the display covers a range of engine speeds, it is possible to establish a desired speed within that range, such as the setting of the actual desired idle speed.

Abstract: A sealed display device comprises a case for encasing a meter such as a speedometer, tachometer, odometer and the like, viewable through a display window or opening formed in the case, with a transparent cover sealed over the opening. The case has an annular lip surrounding the opening and adapted to receive a peripheral edge of the transparent cover. A layer of sealant is placed between the lip and the cover to seal the cover to the case. A plurality of spaced support members support the cover in spaced relationship to the lip so that a sufficiently thick layer of sealant may be placed between the cover and the lip to prevent breakage of the seal due to differences in thermal expansion and contraction between the case and cover. Angled areas may be milled from the case in surrounding relationship to the lip to define areas for accommodating a thicker layer of sealant than could otherwise be accommodated.