Yanmar 6LY2STP
 

Hi guys, hope someone here can help me. Ive just bought a used Yanmar 440, and my intentions are to fit this in 28 foot riamar hull. I have recieved the engine and connected the new B Type panel but I am having trouble getting the Tachometer to work properly.
Can anyone tell me if the Tachometer works from the alternator or a sensor on the flywheel housing?
Any help would be greatly appreciated.