Howdy Flash,
I just finished putting a centech in my 74 and everything went well.I still have a problem with the windshield wipers returning to park position but they work well. My neutral safety switch was not funtioning correctly which I had to figure out and I blew a few fuses. I am not a mechanic nor an electrician but I could do it easily the second time. Overall a very good investment and with one call to the tech center I had about four days in it.
Good luck if I can be of any help holler,
Samo