I don't have any gauges.
I'm still learning about mods and I'm not really sure what I've got. I bought the truck used, and there is a superchip installed under the dash. It has XLE8 hand-written on it, but from what I've read the XLE8 was for '99 models. Additionaly, there was no controller with the truck when I bought it. Do you need to have the controller plugged in order for the module to work?
I figure I should just go ahead and run the codes anyway. Will they still show up if I try to read them after the check engine light has gone off?