gm 350 help

I have no idea what these 2 plugs do the one off the coil and the one off the back of the motor

http://www.pittspeed.com/uploaded/DSC00071.JPG
http://www.pittspeed.com/uploaded/DSC00077.JPG

this is going to be my tow rig for the summer if it ever runs
http://www.pittspeed.com/uploaded/DSC00074.JPG

wire by coil is for a tach hook up,what color wire is on the rear plug?
what happand to the daully?

The dually is going up for sale, just cant afford it, it just got a bigger new twin screw kenny bell charger.

thanks, im not sure what color that wire is i am going to have to look, i think it might be for and o2 sensor but i am not sure

if its purple,it is!

Crank pickup?

I’ve seen that Burb on my way home from work!

That thing is awsome. And I will second crank pickup for the plug in the back. The coil can’t help ya.