Abstract: A method and apparatus for concentrating diverse input signals indicative of the state or magnitude of a variety of functions and conditions of an engine-driven watercraft is disclosed. A power regulation portion includes a feedback resistor configured to form a hysteresis loop to prevent operation in a linear region when an over voltage condition exists, thus protecting the circuitry from excessive power dissipation. The apparatus also includes a reverse voltage protection circuit including a diode and a polyswitch that protects downstream circuits from application of reverse polarity power. An inventive method for determining the speed of the watercraft, using a measured pressure, and which includes a calculated component designed to account for the effects of the friction as in a pitot tube is disclosed. An input is obtained from a user-actuated switch, such input being used to vary an adjustment factor, which in turn varies the watercraft speed determination using the inventive speed method.

Abstract: A method and an apparatus are provided for displaying a value of a measured parameter for an engine-driven vehicle, such as the speed of an engine. The apparatus includes a microcontroller which receives a data signal from a data concentrator. The data signal contains information relating to the value of a parameter which has been measured by a sensor or other measuring device. Based on the value of the data signal the microcontroller generates one or more motor control signals. The motor control signals are used to drive a stepper-motor. The motor rotates an output shaft which has a pointer mounted near one end of the shaft. The angular position of the output shaft upon rotation corresponds to the value of the parameter and the pointer helps to provide a human-readable format for the parameter value.