Aftermarket tach install

[Avenger]

K, I've finally gotten tired of trying to get the stock tach fixed and went ahead and got a 5" Autometer tach, model 233905. Do I hook the tach signal connection directly to the output from the computer? It's a 93 3.0 Duster.

[bmxrider]

run the green wire threw the firewall, hook the green wire to the negative side of the coil.

[Kid Doc]

How do you tell the negative side of the coil?

[asless]

The negative side is the one that is half empty. (-)The positive side is the one half full. (+)

[bmxrider]

all coils have a neg and pos. you'll see the neg and pos on the top of the coil.