A few years ago I bought a used snap on compression tester. The gauge was messed up so I bought a new one from snap on. It came with 4 hose adapters and another little adapter and then a random no name adapter. There was a sheet in the case that listed compression numbers for 1970 cars so I'm guessing that is how old the tester is. There was no snap on part number anywhere on the tester and when I was speaking with snap on to figure out what replacement gauge I needed they couldn't help identify it. Just wondering if the adapters I have will work with all newer vehicles or if there is other adapters I should pick up to be able to work on newer vehicles? Hopefully you can see what I have from the picture, if not I can get more pictures or measure the threads to see exactly what I have.
It really depends on what you work on...are you a tech? Dealership or independent? Any diesel - diesels req. 300psi gauges, minimum...some up to 600psi or 1000psi...Aircraft? Small engines?
Of what you have, you should be good for most gas vehicle engines...not a lot has changed since '70...Ford Triton engines are an exception....they require a special long nose 14mm fitting....there are also some oddball late model Toyota plug bores...I'll assume you have an 18mm fitting - they're common, now...some small engines require special fittings...depends on the plug bore/thread and access...diesels are a whole different subject - I have a <$200 Star setup that was supposed to cover "American" automotive models, but I ended up having to purchase fittings for Cummins B/RB and Ford/Navistar, two of the most common "American" applications....
As I suggested, decide what it is you're looking to do with your tester, or career, and go from there...
BTW, most "tool truck" compression testers are rebranded...SO is US Gauge for the gauge itself,at least back to the early 90's, so you'll be money ahead getting what you need from the OEM...MAC/Matco/Cornwell are Star...the fitting to gauge connectors can vary by manufacturer.
