I have an old Audie Tech Flow Quick air sensor that I have used for years on an old 360 block as a homemade flow bench. I know it is not as accurate as a real bench, but it let me see before and after results. Anyhow, we tried to flow yesterday and although it comes on, it will not take a reading. I can't complain, I bought it when they first came out, so its pretty old. Bad timing though.