I've been playing around with an Innovate MTX-L gauge in my daily '73 Dart for a couple of months now. It's great fun being able to 'see' what's happening inside the combustion chambers.

Only difference is my car runs on Propane/LPG.

I've learned a lot aswell, but mainly how to tune a simple IMPCO propane system where the main tuning items are only a mixture screw and max-power screw on the LPG-mixer.
A lot of factors play a significant role in mixture-quality, especially with propane. As propane expands when heated, it also increases in pressure but mainly when it's a liquid state. When it's heated as a vapour under a controlled pressure/vacuum, it will lean out. Temp-differences with propane play havoc with your tune.
But with playing around with different springs in the propane vaporiser and the mixer, I've achieved a (I think) a very good tune now.


Pic below shows an AFR-number while idling from a while back.
The engine currently idles with an AFR of around 17 when warmed up.