| 摘要 |
<p>A device for indicating certain undesirable operating conditions of an automobile engine or the like. The device is preferably incorporated with the usual speedometer or tachometer normally situated on the instrument panel of the vehicle. Accordingly, since the device functions in conjunction with the usual speedometer needle or the like, included therewith is a second needle indicator which normally is aligned with the speedometer needle and disposed in front of or behind it, i.e., when the efficiency of the engine is within certain predetermined desirable limits. The device includes a bellows assembly which is responsive to the changes in the intake manifold vacuum of the engine normally brought about by certain settings of the throttle. Also included is a shifter assembly which is operably interposed between the speedometer needle, or the like, and the second needle and is responsive to the bellows assembly for proportionally displacing the second needle from the speedometer needle as the engine efficiency diminishes below the predetermined desirable limits.</p> |
