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The orig gauges are totally inaccurate by now.

Bluefire or scangauge is likely your best option. VMSPc is no longer available.

I run Bluefire. The trick will be finding an adaptor to go from the ALDL plug Newell used to their 9 pin round plug.

Here is link for the adapter, its listed on Bluefire's website but I know I was a bit confused when I was looking to figure out which one I needed. 

https://obd2allinone.com/products/ALDLto6Madap.asp

I would agree for most of what he wants to do the Bluefire would probably be best.

I have some old school DDEC readers that i picked up for deeper investigation, Pro-Link is what they are called. They require different cards for the different versions of DDEC.