This is for the Lemur Bluedriver. I have had this for a while and just realized that the intake manifold absolute pressure on the app has been giving me a low reading (avg 8.5 inHg). Not willing to take it at faith value, I hooked a vacuum gauge to the testing port and was given a normal reading of about 18 inHg. elevation of 2,500 ft. so this is about normal. Does anyone else use the BlueDriver and had any issues with accuracy?