I'd be interested in this upgrade too if we can find a fix for the cooling gauge issue. With that being said, I'd rather pay more for the fix than have a workaround in that if I have to buy an ECM, I'll buy an ECM.
I'm a little scared when it comes to removing needles.
I have nightmares back with indiglow/reverse gauges were 'in' needles would never go back on right and their accuracy was terrible. Thinking I might just stay with the plain black one.