Thanks for your replies guys.

OK, think now im going to take it out and bench break it in. Will give me something to do while waiting for my radio gear. Really helpful tips there though.

I think running it on the bench will also give me a feel for how the needle reacts to changes before running it in the model.

Im hoping this MDS will serve me well, i hear alot of bad things about them. I used an MDS 40 in my low wing plane a few years back. Only real problem I had with it was transitioning from idle to full power it would splutter as if too rich, im guessing the low end was too rich.