Personally I just cut the wires and either shorten or lengthen them one at a time so you don't get confused. I basically do this for a living (computer engineering tech) and finding the correct pins to crimp on the wires is bad enough, but the crimp tool will cost a small fortune if you can even find one. Your standard AMP super champ crimper is not going to do the job. I'm using the entire Z28 wiring harness in my car (insane I know) and so far I only have one unused wire going to the ECU. I will leave about 6" of the wire, put some heat shrink over the end and wrap it into the harness, just in case I ever need it, I think it came from the ABS or the traction control, don't remember right now. It’s a brown wire at the corner of one of the ECU connectors if memory serves me.
I used the '94 Z28 metal tank from my donor car. The '01 is no doubt a better choice but since I had this one and it was in perfect shape I decided to use it.
BTW if you need the connector and pigtail for that Camaro gauge cluster I will have one. I am converting over to Firebird gauges cluster because I think it looks and fit better in my dash plan. But of course the Camaro and Firebird use different connectors!!!!! This is assuming I can find a GM # 12065803 connector, probably have to go to a dealer. There are pinouts for the Camaro gauge cluster at http://shbox.com/1/95_z_cluster_pinout.jpg
But it doesn't look complete. If you need that I can get it from my Camaro manual.