Instrument control for my boat by manualmakaren

This sketch is missing a short description

I have a slow boat with an old VP7A diesel. I need means to supervise the engine. The Arduino will input signals from various sensors on the engine and display the reesult on a 2X16 LCD display: - Rev.meter, triggered from a magnet on the flywheel via interrupt. - Temp.meter for three different engine temperatures; cooling water, oil, exhaust I will later add an oil pressure sensor.