Tire Pressure Monitoring Valve Caps Sensor Gauge - Advanced Detection System, 110 PSI Sensing Air Alert Indicator for Cars, Trailers, Bikes - Chrome-Plated, Pack of 4

I got these on my 25 Cougar. No issues or complaints. You can really see the green indicator from an appreciable distance and they do not leak. I’ve got 2 months on my installation and haven’t lost the slightest pressure. They seem very durable and well made. Look nice too. A bit pricey but with a caveat, it’s a better price as compared to a TPMS.

Only use these on tow vehicle and trailer. TPMS don't like me.

So glad for these easy to use. I can now at a glance see the pressure in each tire on my trailer 110psi. Recommend getting some short metal valve stems they are made of a strong quality and may wear out your typical rubber valve stems as some others mentioned in some reviews.

If you don't have them on TIGHT, they will cause the tire to lose pressure slowly.

Great so far on my commuter car. Good price

Great product. Very convenient. The batteries for my older vehicle TPS died and gives false readings. Vehicle is too old to justify spending big money to repair. These caps allow me to do a quick walk around to check tire pressure for a lot less money. I tried some of the cheaper ones from Amazon, which were OK, but these are definitely better. Highly recommend!! I have bought several more since my first purchase.

I have been using these pressure monitors on my car for over 3 months now, and I am amazed at how well they work! As these are rated for 40 psi, I keep the tires inflated to 43 psi and now I can check pressure on each tire simply by looking for a green indicator. Excellent.Few things I noted...After hand tightening a monitor to the valve stem of each tire, you really must drive your vehicle for like 10 miles first in order to "prime" them before you'll get an accurate reading. So, keep this in mind should you ever need to remove the monitors for any reason, like when it's time to change your tires.After a monitor has been showing all green for a while, if ever it begins to show just a little red, then that is an indication to check the tire's pressure immediately using a good quality pressure gauge.To save the most gas (in this case by reducing friction with the road) you'll want to inflate most tires as close as possible to "max press" (maximum pressure) rating stamped on the sidewall. I had a buddy in college who was a real cheapo and always kept his tires inflated to max press with nothing bad happening. But that still makes me nervous, so I try to stay 5 psi under the maximum rated pressure.Chris

I can understand both the pros and the cons to these tire pressure monitors. When installed and working properly, they perform as advertised and provide vital feedback about your tire pressure. Unfortunately, the set that I received included one defective valve cover.After reading the installation instructions both on the package and online, I meticulously installed these on my car. Prior to doing so, I added precisely 38 pounds of air to each cold tire. As per the instructions, I cleaned the tire valve stems, made sure that the o-rings were properly seated flatly in the valves, than hand tightened each valve cover. As expected, when tightening the valve covers, a small amount of air was released from each tire. Also, as expected, each valve displayed green, meaning that the tire pressure was good.Next, I sprayed a leak detection solution onto each valve. Soapy water would work just as well. Knowing that I had installed the valves exactly as instructed, I was certain that no leaks would be found. Unfortunately, I was wrong. The first two tires were fine, but when I inspected the third one, air bubbles were noticeably leaking from the new valve cover. The fourth one had no leaks.Since the instructions clearly state that the valve covers should be hand tightened only, I was extremely careful doing this step. Thinking that I may have not used enough force when installing them, I tightened the leaking one as much as I could, but once again, just by hand. The result was the same, air continued to leak out.Since I didn't want to waste my time returning these to Amazon, I decided to remove them from my tires and throw them in the trash. As far as I was concerned, they served little purpose unless all four of them worked. I also figured that if one failed the leak test, the others might do the same at a later date. I purchased these for peace of mind, but I got just the opposite.When I removed the valves from the tires, I discovered that three of the o-ring seals were intact. Unfortunately, the o-ring on the leaking valve cover had been torn apart, despite my having checked it beforehand, and installing it correctly. I ended up putting the old valve covers back on the tires, and will simply check the pressure on a regular basis.The bottom line is that these tire pressure monitors have the potential to work well, but they also have the potential to fail miserably. Since the package that I received contained one defective valve cover, I can only assume that it's a hit or miss with this product. I wanted these to work, and I wanted to give them 5 stars, but unfortunately it didn't work out that way. Based on my experience, I would not recommend purchasing this product.