This is a common marine instrument used to measure engine revolutions per minute (RPM). The "Sierra" part indicates the manufacturer, while the "7000" likely refers to the tachometer's range, up to 7000 RPM.
Key Features:
RPM Measurement: Displays engine speed for optimal performance and maintenance.
Marine-Grade Construction: Built to withstand harsh marine environments.
Clear Display: Easy-to-read tachometer readings.
Hour Meter: Often includes an integrated hour meter for engine maintenance tracking.