Is the wiring harness on a 05 flhtpi different than one on a standard model?

Yes it is different. I have a 2004 FLHTPI. The wiring harness for the FLHTPI is set up for the extra lights and accessory plugs for the additional equipment/electronics that the police bike is outfitted with. I tried to install the air temp and oil pressure gage in the dash and could not match the schematics on the installation instructions to the wiring harness. I had to bring it in to have the gages hooked up. I plan to add a stereo and will run into the same issue with the wiring harness. I haven't found any good resources on the internet regarding solutions yet.