5.7 Hemi into an old Suburban.

I have just started a 5.7 hemi swap into a '68 2wd Suburban (partially for the power, partially to piss off the Chevy guys). I have a complete 2005 half ton Dodge pickup donor. I plan to use the complete motor/trans (auto), along with the stock gauges from the Dodge.
I know there are a lot of threads regarding this type of swap, my main concern is the wiring. Many say to run an aftermarket harness, does anyone know if the aftermarket harnesses are compatible with the stock Dodge gauges? Would it be easier/cheaper to use the stock harness in this situation? Any help is greatly appreciated!