Vdo tach wiring4/6/2024 ![]() Its pretty standard in boat wiring to bypass the main battery switch for one thing. At the top left of the diagram we see the cylinder selector switch. Black grey and purple wires were attached to it. Most vendors will use one tachometer head to cover a variety of engines. You want to minimize the resistance and the voltage. We have gathered numerous pictures hopefully this picture works for you and also assist you in locating the response you are looking for. 1 here shows the back of a typical gauge. The longer a wire is the more resistance it has and so the more the voltage drops from one end to the other. This way even if your battery switch is off if your boat starts filling with water the pump will still kick on. The thicker a wire is the less resistance it has. Its important to make sure youve got the correct wire for the tachometer which means you might need to use a multimeter with a tach setting to test the wires correctly and consult the shop manual for your engine. Id rather have a dead battery than a swamped boat. Boat gauges wiring diagram boat tachometer wiring diagram faria marine tachometer wiring diagram vdo marine tachometer wiring diagram. ![]()
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