Gauge Cluster Issues/IVR

Alright I got a sunpro volt gauge on Amazon. I had credit which I did not realize, so I only had to lay out $4.44. I was reading another thread that has 9 pages to date. That has a lot of info on both subjects. The Sunpro swap and the MAD amp bypass. Has anyone done this combo in a way that had worked successfully for a long period? There seems to be a lot of differing opinions on how to do the MAD bypass.