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Okay, after reading the replies here, I bought a tach for my '05 TBA and I want to install it. Under the dash I have three sets of wires ending in plugs: 1) orange wire, grey wire; 2) red wire, green with thin red stripe wire; 3) purple wire, brown wire, red with thin blue stripe wire.
The tach ends with 4 loose wires... I am guessing that I want the plug with 3 wires, but what am I doing with the 4th loose wire from the tach? Does anybody have a wiring diagram that explains what I am looking at and what I want?
I just bought the tach and console off ebay and have the same question. My bike is an 03 and I have the same wiring as panda42, but no other wiring came with the tach and the plugs do not fit into the tach. What else is required to connect it? Is the light powered through the three prongs in the tach? or is it separate? Also, there is a hole in the bottom of the tach, is that for a light bulb? There are some complications when you're a cheapskate 
We all like to think of ourselves as rugged individualists. But when push comes to shove most of us are sheep who do what we are told. Worst of all, a lot of us become unpaid agents of whoever is controlling the agenda by enforcing the current dogma on the few rugged individualists who actually exist.
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