Ok, dropped my new-to-me boat (1999 model 4.3 Mercuriser with Alpha 1 outdrive) off at the shop today to have it thoroughly checked out. When I told them I want my gauges and tilt/trim unit working properly (some previous owner installed a plate with toggle switches to control the tilt/trim), I was told that the problem was probably the sending units,and since they would have to take the outdrive off to fix that, then I might as well have the bellows replaced while they're in there - makes sense to me - do y'all agree with this? Btw, there are no service records available, so no idea if the bellows have ever been changed. I was quoted $1000 to change out the bellows/gimbal bearing. Any advice is appreciated...