1988 Yamaha 130 tach wiring

[fishon71]

After pulling my panels, labeled wires well (I thought) now I have a problem with my tach. The two big connecters are fine but I don't know what to do with the loose wires black and light wire, blue. Does anybody have a wiring diagram or know what they hook to?

 

[rodbolt]

Re: 1988 Yamaha 130 tach wiring

the blacks are grounds and the blue is for back lighting.<br />you can hook blue to the light switch or to the ign yellow. hook it to ign yellow and the light turns on with the key.