Installing a tach, what did i goof up?

[GotToGo]

on the 2nd gen trucks there is a wire in the harness on the firewall in the engine compartment.

Could you be a little more specific?

[royster]

Could you be a little more specific?

I took a photo for you. These connectors were installed so that options could be installed quickly. If you ordered your truck (when it was new) with the sport cluster, this is what they hooked the tach up to.

100_0292_LI.jpg

My SunPro tach is wired directly to the coil.

For newcomers who don't know - that metal plate on the firewall has your engine type on it (i.e. 4G64) so you don't need to put "other" in your engine info (below "vehicle"). When we can glance at your avatar area we can see what engine you have, and can make better suggestions specific to your needs.