What is % of engine load readout

Anyone know what parameters the ecm uses to calculate % of engine load- I just discovered this in the data star today. I am trying to watch how hard I run the old girl, having a 1mm 600hp file in it, (it`s a 475 MBN) but still running the stock turbo. My pyro has just started being erratic, so I can`t go by that, and my boost seems to top out at 34 (read one time that`s as high as it will read). Thinking I should be able to run it by the engine load readout as long as I don`t go too high. Thoughts*

 

It`s an ongoing variable readout, changes constantly, not quite sure what you mean by it was at 29%.

 

Yes, but I read one time that this was a maximum value that it could display.. I think it might have been underpsi who wrote it. Something to do with the ecm. It could be putting more boost, but not showing it. Also, I am still running the small stock turbo, which would limit boost. Haven't quite felt ready to
dump $2400 into a new turbo. Also, I guess maybe I'm a little concerned that if I did upgrade the turbo, and the boost psi, is there a possibility of doing damage by putting more strain on this engine, with some 26,000 hrs. on it now? I don't know the previous rebuild history if any, of it. I have had it for only 3 and 1/2 years.