I am in the process of rewiring my 65 Belvedere with a Ron Francis Express kit. I'm about done after two full weekends, will hopefully finish by next weekend. When I had Auto Meter gauges, I just made my own harness and used a Painless 7 relay kit to control power to all the gauges and a couple of accessories.
With the Express kit I have now, it includes a new Headlamp switch that basically works like the old one, and there are a few details that I had to adapt to since I've basically eliminated most of the factory components. I'm running a full MSD ignition: 6Al, Dist, Coil, a FAST EZ-EFI, Be Cool twin cooling fans, and Dakota Digital gauges.
The express is pretty easy to follow if you've done wiring before - I've always done stereos, alarms, lighting, etc., and built my own circuits. This is the first time I've rewired an entire car, and oddly enough even the Express panel with 18-20 circuits is almost not enough for what I'm doing. But again, I'm running far more than the factory's 8 circuit fusebox allowed.
Here's what I did with my Auto Meter gauges:
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Thank you. Im thinking of going with the stock dash harness and buying the gauge wiring kit from autometer. Not sure what other modifications i have to do to the dash harness but seems the easiest route.
I recommend buying a relay circuit for running a set of aftermarket gauges so you can provide individual power to each gauge. The factory fusebox isn't great for aftermarket components, and even on a more modern car I had I noticed that pressing the brake affected a couple of my add-on gauges. When I did my Auto Meter, I bought a 7 circuit relay that was connected directly to the battery with 4 'switched' relays to power my gauges. Plan it out first - make drawings of the gauges and draw each wire and determine where they will go. That's how I've always laid out my wiring. But then, I'm one of those people who loves to do electrical work on a car where most people I've met hate it. LOL