Hello everyone I am curious to know if the ace 150 and the 250 use the same circuit board with a few less parts on the 150 that controls the pinpoint feature.I want to get one and add a toggle switch to the handle to switch to pinpoint easily..If the circuits are the same than I can get a 150 and modify it more easily...If any parts are missing on the 150 board I can replace them when I do the mod.Plus I am going to do the volume control mod as well...any input would be greatly appreciated. Lloyd H