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I've got a Sun ST 602 tach. 3 wires, red, yellow and blue. Can anybody help me with the hookup. I do have the connector for the HEI tach connection.
 

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I have an old Sun Super TachII in the garage, it has 4 wires, Red goes to positive/power,switched side of fuse block, Blue is for the light hook up,connect to a dash light wire, Green goes to the coil, and Black is the ground.


Rocky
 
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