I absolutely wouldn’t install one that wasn’t new or rebuilt. They all fail. Usually well below 200k. I don’t have one myself, but have swapped out a lot.
Dakota Digital box and the unmodified stock cluster. Been set up and running that way for 90k+ miles so I guess it might have just crapped out. Haven’t tinkered with it yet.
I put a factory GM ECM under the dash of a vehicle one time strictly for aesthetics and swore never again. And this was in a much larger vehicle with more room under the dash than an 80.
Mine has been in use under the truck for nearly 100,000 miles. I had my trans and t-case out to rebuild both a week or so ago. That connection was just fine. It’s tucked so high up in the tunnel it can barely get dirty.