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			well not easy to make a harness better to buy one it plugs into your controls box. the harness has 3 wires a Purple, grey, black, OMC don't use the dark blue. But buy the harness usually cost $8 
		
		
		
		
		
		
			Purple is power on with ignition switch Grey is the tach sending unit wire Black it the ground 
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	1978 V20 Cuddy w/ 225 Johnson. And Several other boat's  | 
		
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