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Discussion Starter #1 (Edited)
I have a Sun Tune tach for my wagon and it has 4 wires coming of of it they are : orange, white, grey and brown. Can anyone shed some light on this for me?
Thanks Jeremy
 

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It almost sounds to me as if you've got a real old one that requires a transmitter...I'm not sure however. The oldest one I have is probably late 70's or early 80's and it has red/black/green & blue....
 
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