I have one of those Harbor Freight set, one of the hookups doesn’t fit right and the high pressure gauge sticks at the highest pressure it sees, so its useless. I also have the cheap one from AutoZone, the other hookup doesn’t work but the gauges do. I’ve cobbled them together to make a useable set, but I don’t fully trust it.
This year, I’m going to get a good set. One trip to a shop will cover the cost of a good set.