I have not installed the harness that you are using, but I would tend to think that they are all pretty much the same. All of your gauges ( excluding the alternator ) should receive 12 volt power sourced from the "Gauges" terminal on your fuse block. If you are wiring the gauge harness yourself, you would need to daisy chain from one power lead from one gauge to the next. This will in turn also take care of the amps needed for the gauges. The alternator has a lead that is tied into alternator depending on if you are running a 1 wire system or not. You should also daisy chain your ground from one gauge to the next and follow you ground all the way to the fuse box. Connect this to your grounding block and you should be in business.
Please let me know if this helps, or if I am missing your problem. If you continue to have problems, we can look at other problems / solutions.