[67RS/SS396]

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?

 

[Everett#2390]

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.

 

[67RS/SS396]

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?

 

[Everett#2390]

As I read the instructions, yes, switched IGN power supply.