Hydraulic hose Q's

You need to match the hose pressure rating to the application. Single wire hose should be fine. Two wire is more common, and more money. Single wire is more flexible. If you can get the Gates Megaflex that is very nice stuff. Most applications use NPT fittings - pipe thread. With the pipe threads you will need to use pipe sealant (aka Pipe dope) Don't use teflon tape, unless you like leaks. Loctite PST is the best. Most accessories have pipe thread, i.e. gauges, valves, cylinders... Another option is the JIC fittings. This does not require pipe dope. It is also less common in agriculture applications. You can not mix and match fittings, so you should see what you have and match accordingly.

Fessman

Another alternative would be to use a 1/2" mpt fitting on one end, and a 1/2" swivel fitting on the other end.

If you decide to go to flare, there are 45 degree and 37.5 degree fittings, and I far as I know, you could use either one for this application, as long as fittings that mate together are all the same degrees.