Orion Motor Tech AC Gauges, Automotive AC Gauge Set for R134a R12 R22 R502, 3 Way AC Manifold Gauge Set with 5FT Hoses Couplers & Adapter, PR134A Can Tap Freon Recharge Kit for HVAC

I am not an A/C expert or even experienced in A/C systems diagnosis and recharging. The gauges were easy to assemble and use. The gauges are in Celsius as others have commented. The gauges come with everything needed for R-134a systems except the can tap, and the kit included an adapter to go from gauge set to the can tap that I purchased seperately (I purchased my R-134a can tap locally, but it is similar to the taps offered on Amazon by WINOMO or the Interdynamics DV-134). The gauge hose fit to the low side of an R-12 system with the R-134a quick coupler removed, but would require an adapter for the high side which I did not need or look into as I was only using it to fill one can into an old truck. I bought a Robinair 10102 side can tap for the R-12 can which worked well and had two different sized fittings, one of which was sized tor the gauges yellow hose which just screwed on and the other fitting on the Robinair side can tap accepts the adapter included in this kit if you wanted to do that for no reason and then screw the yellow hose to the adapter. So for R-12 system the gauges hose connections for the yellow and blue hoses screwed directly on the can tap fitting and the low side fitting in the vehicle. For the R-134a system the provided quick couplers in the kit fit on the high and low connections at the vehicle and the provided adapter in the kit fit to the can tap. The gauges worked properly for the two vehicles that I worked on today and altogether the quality appears to be average or acceptable. With this OrionMotorTech gauge set you can accurately see what is going on for an R-134a system (not for R-12 without the additional purchase of a high side adapter). These gauges are MUCH better for filling R-134a system than the R-134a refrigerant can with a one piece cheap gauge and short hose that is sold to fill systems. Those have always been frustratingly inaccurate in my experience and I think that they are worthless. As far as knowing what you are doing for the diagnosis and fill, accurate information on checking/filling and gauge pressure readings on the internet is not easily found, but this helped me: vehicleairconservices /page/gauge_readings . Start with the vehicle on and A/C off and use the associated pressure chart, I believe that this checks the system overall fill pressure and if it is low overall, probably needs a recharge. Then turn A/C on max with windows down and run vehicle to normal operating temp and use the A/C on chart. There is also some basic diagnosis info included. Use all of this information at your own risk. I’m not an expert as already stated, very much a novice on A/C systems, but I am a graduate level backyard mechanic. Good value for the money in my opinion.

My Mercedes SUV ‘s A/C stopped cooling. I hated to take it to the dealer due to their exorbitant cost. Using this set of gauges with a can of R-134A from the local discount store got the A/C working again. I did have to buy a small adapter for the can. It was cheap and also available at the local discount store.

I had a truck to sell after it sat for 4 years in the yard and I revived it. The AC was completely empty - no Freon at all. Bought this manifold for my first try at AC work and it worked out great after taking a crash course on AC work by watching several YouTube videos. For the price of an AC mechanic just "looking" at my truck I got the AC to work and it blows super cold. Make sure to evacuate the system with a vacuum pump first which I also purchased at the same time as this manifold. Ended up with a Fixed AC for about $160 total... approx. $140 (manifold + vacuum pump) and 2 x 1lb. cans of Freon at $20 from Walmart.

well built easy to use

As a mechanical engineer in the HVAC field I figured for the price why not put these to the test and see how they hold up. I can tell you I ran these things hard all day, and on more than just r22 and 134a. I tested with a tee and my testo manifold, the gauges are accurate but *** in Celsius*** when I ordered these I was high and wasn't paying attention. Regardless the gauges themselves are all that withstood a month of service in an actual HVAC field. I'll begin with the hoses... At first for cheap as dirt they performed well even operating over 300psi. but after a week or so the gaskets which are rubber not sure why.... Were destroyed. Not able to pull a vacuum at all. The manifold is okay but the sight glass got foggy after a few uses and I was never able to get it completely clean. I'd find myself laughing as the low and high side handles repeatedly broke off in my hand. Super long story short for $20, you'll get a few uses then you can simply trash them. So if you want a disposable set I'd suggest these since they're so cheap if you simply are a diyer that wants to charge your cars ac, and won't mind them breaking after a use or two. If you're a future HVAC tech and you're looking for a starter set, do yourself a favor and buy a testo, field piece, or yellow jacket that's proven to withstand the test of time.

I can’t attest to how long the gauges and pump will last long term but they have been great for the first couple uses. The gauges are Accurate, leak free and have quality fittings. The pump works as it should and pulls a great vacuum. I let it run for 30 mins with no issue.

I did not expect an amazing quality at this price. Honestly I would be perfectly ok if they only lasted a few months. My old gauges got stolen and I needed a quick solution to sort my cars AC.I hooked them up for the first time, they started leaking because the gaskets are absolutely terrible. Took them offand tightened them down only to find that one quick connect valve already broke, it just got stuck in open position and I had to twist it and put some pressure a couple of times before it released.After i sorted that i could finally hook them up again, topped my system up, no issues here. Unplugged the high line, shrader valve leaking. Not a lot but noticeable with finger. Managed to tighten it up with a tool. Took low side off and there valve got completely shredded. I lost all my refrigerant, middle pin for completely bent and had to had it replaced. And no. This is not a user error. Not my first time using ac gauges. My old set never cause me so much trouble and never caused any damage.Now i am out of pocket at least 4x the price of these gauges because I figured cheap set will be just fine for a while... Learned my lesson the hard way

Nice gauge set. Works as good as the $100 set it replaces.