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2000 90 hp tlry stroke, how come my tach is not working

200090tlry

New member
Ok I bought this boat asked the seller if tach ever worked he mentioned I dont know lol. He pulled a johnson 60hp and replaced with yamaha 90hp. Under the dash I found some of tach wires with ring terminals grey,purple,black, purple was hot with key. I then found four wires yellow,red,green,black wires and red is 12volt hot all time. Looking at tach it has johnson system check and again the purple wire has 12 volts to the tach. How can I check grey wire sending signal at tach location to see if it's even working. If nothing then I can put my volt meter on grey wire I found and maybe yamaha green wire. I will spice the green if the signal is there, or other grey. Can I do static test to findout which wire does majic. Tach is Johnson OMC Faria 7000rpm I think standard on Crestliner superhawks. Another thing back of tach has a 5 or 6 setting, is this unit even going to work with yamaha.
 
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