Review on High Pressure Adapters Diesel Engine by Joshua Reid

If you work on diesel engines, they should be in your tool kit. There is no need to buy an expensive tester with valve and sensor. Simply plug in an air hose fitting and connect directly to the air compressor line. I've used homemade versions of these for years and never really damaged the 125psi sealed oil system. It's definitely a great buy that you're spending so much money to make it yourself.