Bypassing the Amp gauge - Question about the MAD Electrical method

The next car I buy from the 60s or 70s, I am going to buy all the wiring harnesses up front and change them all out. I think I wound up buying most of them anyway to get where I am at, but it would have saved me a whole bunch of time and aggravation chasing a whole herd of sparky gremlins. One of my friends did that and it only cost about $700 with a good sale for a body.