Gauge assembly was easy to install and worked great but could have used a longer hose.This item is not as good as the high-end competing product that has a steel braided hose and heavy duty gauge. I think you would want the steel braided product if you used this for an auto repair or muffler shop. But I just needed it to test my personal cars, so I wanted something that is decent quality to be used maybe once or twice. This product worked great for that purpose. I was a little worried about the "rubber" hose (instead of steel braid), thinking it would quickly melt if it touched anything hot. But the rubber used is a very high quality. Almost like coolant hoses (without the nylon braid inside though). So you can use it in a hot engine compartment no problem. As long as you don't directly hold the hose up to a red hot exhaust manifold or something like that, it is fine. The gauge and dial are decent quality, not the best in the world, but definitely decent enough to get the job done, and seem to read fairly accurately. Later, I even went over to a friend at a muffler shop. He checked the pressure with his professional gauge, and this cheap gauge was right on the money on the psi reading compared to his professional gauge.Again, this gauge is perfect for the weekend mechanic that works on cars, and is careful handling tools. But for a auto repair shop, professional mechanic, or muffler shop, this gauge would probably fail or be destroyed after a few months. In that case, get the other brand with steel braided hose and heavy duty gauge (but that one costs 2-3 times as much as this model).I recommend buying from these sellers, very fast shipping, it was boxed a really good and it was exactly as advertised.I bought this tool several years ago but had not used it until today. The fitting that cruise into the exhaust manifold in the screws into the exhaust manifold is fine.The fitting on the end of the gauge hose is made out of metal much too soft for its size. In addition to having to spin the entire hose and gauge while threading it into the fitting, just as you expect it to snug up to the manifold fitting, it suddenly gives way with no real warning. I work with vehicles regularly. Maybe mine had a manufacturing defect, but I do not twist off fasteners on vehicles. Ever. Assuming for a pressure test a snug fit is necessary, it is apparently way too easy to torque this right off. I was using an open-ended wrench not a socket to avoid the lack of feel when working with delicate pieces like this.Food for thought. Might be a great tester but I will never know because the piece that twisted off is integral to the rest of the gauge and cannot be replaced which is a poor design in and of itself.Ironically, I chose this tool based on everyone else's positive reviews several years agoOh well. Maybe I will try to find a way to rig this up but I doubt it's possibleGot this gauge to check exhaust backpressure. Removed O2 sensor and screw gauge and adapter into sensor hole. Started truck, gauge read about 1 psi pressure, showing no blockage.So my car was acting up and would not accelerate more than 15 mph. Bought this tool because a buddy told me that the Bonneville's had an known problem with the plugged cats. Took me less that 15 minutes to diagnose a plugged cat. Bought this tool for 1/2 the price the shop wanted to do the same thing.Serves it's purpose for the price, would like the end to be swivel type fitting so u wouldn't have to spin the gauge and hose to tighten, would like molded case for unit, could of paid more for that I'm sure.I read some other reviews and made sure not to run my engine long enough to let heat build up at the O2 sensor holes I was testing and melt the rubber hose. No problems using the gauge; I could easily see one side of my exhaust is blocked and the other side wasn't.