I replaced a failing VDO sensor with this one (the VDO failed at 70 hours of use). It actually is a small enough diameter that I was able to put this into a spare hole on my firewall mounted manifold and not have it stick out like the previous beast of a sensor. The only reason for one star down is the wire used is not aircraft quality wire. So far this is working well (one test flight)... This was not a drop in replacement for the VDO so there was some minor rewiring involved.