Scanmaster vs Scanmaster 2.1?

I have the old one as well, no O2 cross-counts and the display is a bit dim but it works for me. You can upgrade if going the power logger route. I like the new scanmaster gauge if I ever upgrade
 
Yes I failed to mention my display is getting funky to read. I may look into the Power logger route since I'm about to get some items from Eric@TT.
 
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