On the top of my T-5 that I just pulled out last weekend there is a sensor or something. I took it off so I could get the top cover off and look at the condition of the gears. Well, apparently, underneath that sensor was a small pin and I've seemed to of lost it (of course). I need to know what that sensor is for and how important it is. I've seen pics of the 3550 and TKO have the same sensor except it's located on the left side of the tailshaft.Thanks.