Herein is the picture of wiring marine tachometer instruction/installation with diesel alternator type. The tach/hourmeter is designed to operate only in 12V negative ground electrical systems.
The picture consists part lists as followed: 1 pc Gauge Assembly, and 1 pc Hardware Package.
You may have the wiring instructions you can download in pdf filetype. It contains informations such equipment needed to complete installation, preparation, determining range selector switch position, Gauge installation, connection of wiring, calibration and adjusment (source: teleflexmarine.com).
