fitzmooney

Hi Jeff, Glad we sorted that out. Mine is about 6 ft out, under the left wing in my 231 and triggers the Hobbs, which is on the right side of the centre console at 70 knots. Not a good place on the belly, as it is prone to damaged by rubbish thown up by the prop. I would put a meter or a light globe in series with it and see at what speed it comes on. Cheers, Mike

Could possibly be the remains of an air switch for your hour meter. Usually they are a bit longer and wider so they come on at about 70 knots. Cheers, Mike