....The only way to find 100% sure answer (maybe) is to take it to a trusted MB mechanic and have it fix it...
That is a whole other issue.
Going back to my original question. I don't want to sound like a bore by pressing the issue and I do appreciate the participation and information one finds on this site, but I want to go to the shop with more info. I say this after reading many strings here -
I know for a fact that replacing sending units ( I had cleaned mine and reinstalled it ) does not always fix these "gauge accuracy reading"problems. There are many unresolved issues with VDO gauges and no conclusion.
The bottom line here...I was trying to see if anyone reading this post could tell me " Oh Ya, mine was
definetly the gauge itself, not the sending unit" or something to that effect.