Watch out for the dimensions
Watch out for the dimensions that are quoted for the units. They are for the box, but at the rear of the flat pack, and maybe for the round too, there is a plastic block for the pitot and static connections that adds ~3/4" to the overall length. Add space for the actual NPT fittings and figure on more like 1.5" longer than they quote. For most it shouldn't be a problem, but for our it ended up interfering with some stuff we have behind the IP.