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Premium Member
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Discussion Starter #1
I just purchased a stewart warner tach with the sending unit. I have a diagram of the wiring but a little confused on the battery side coming off the sending unit.

1. Does it need to go to + side coil? (if so what ballast resistor do I use?)
2. Does it need to go to battery and coil?
3. or just the battery?
And where would the sending unit normally be placed on the car?
 

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Super Moderator
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The red wire for the amp is IGN power - from the IGN spade on the fuse panel - before the resistance wire going to the coil.

I remember the box being installed on the firewall, I could be incorrect, maybe other members will remember the placement of the box.
 

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Discussion Starter #3
So do I just need to run one wire from the ign. tab on the fuse box to the battery screw on the sending unit?
 
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