There should be an aluminum plate on the left side on the bell housing, with the serial number stamped in it. Super H's were only made in '53,and '54. If it is in fact a Super H, there should be a C-164 cast into the block, designating the 164 cu. in. engine. If it has a C-152, then it is more than likely a regular H.
Had to blow the picture up, but it appears to have a Delco conversion distributor in it. So if it needs, or you want to do a tune-up on it, you'll need to go to an auto parts store, and get a contact point/condenser set, and distributor cap for an early 60's vintage Chevy 153 4 cylinder engine.
Since it has a 12V battery, since I can't see the left side, I'll assume they've put an alternator on it. You could take it to a starter/generator shop, and have it tested to see if it works. The simplest alternator to use, is a single wire GM alternator. They have a built in regulator, and only require 1 wire, which you would run to the post on the starter.
If it still has a generator, more than likely it needs rebuilt, and new voltage regulator. The 6V starter will work with the 12V battery, just don't grind on it too long, to try and start it. If the battery cables have been replaced with lighter 4 ga. cables, that's more than likely why they put a 12V battery on it. A 6v system requires at least 1/0 cables to handle the amps.
The 3 pt conversion looks fairly new, and that alone is worth in the neighborhood of $800-$1300 alone, depending on the brand. And that's minus the cylinder, drawbar, and hose. They're not perfect geometry wise, but do work decent. Had one on an M I had 30 years ago. They are limited to what they can pick up, as the OEM hydraulic pump only produces approx. 800-850 psi. if the pump is working properly. And, it will be somewhat slow. The tractor does not have live hydraulics, so the 3 pt. will only work to lift with the clutch engaged. It is controlled by the rod, going to a lever on the side of the torque tube, where the belly hydraulic pump is located, to the right setting in the seat. It should have 3 positions, pullback to lift, all the way forward to drop, and midway, should be a nub on the rod, that catches on like a flat spring steel piece, for the hold position.
I'd highly suggest a set of sway bars, or chains to limit the lift arms side motion. Even with a 3 pt. blade set at an angle, it will pull it off to one side. Something like a rotary cutter will slam to one side, when making a turn, especially on a slight side slope. And, if your plans are to use a rotary cutter behind it, some weight on the front isn't a bad idea. These tractors were designed to be used with drawn, on mounted implements, not 3 pt.
The gauges not working could be more than several things. There should only be an amp gauge, and oil pressure gauge. As far as the amp gauge, depends on what has been done to the electrical system. If it still has the OEM generator, more than likely it needs rebuilt, plus an new voltage regulator, or simply, just a new VR. If it's been converted to an alternator, they've bypassed the amp meter, and wired directly to the starter post, as mentioned above.
Oil pressure gauge could be a couple things. The small line plugged with sludge, or just a bad gauge. Easiest way to find out, if loosen the small line where it attaches to the block, and see if it leaks oil when running. If it does, you can disconnect the line at both ends, and spray carb./brake cleaner through it to clean. Maybe a good shot where the line attaches to the gauge to clean that in there. Then reconnect, and see if the gauge works. If not, depending on how particular you are, you can get a replacement gauge, that uses a pressure line to operate, at an auto parts store. I haven't bought one for years, but most came with adapters to connect to several different sized lines. Case/IH does not offer gauges, but there are a multitude of aftermarket one's out there. I've seen good, and bad reviews on one's from even the more popular aftermarket vendors.
Overall, that tractor looks to be in good shape. Tires look to be decent shape, unless cracked, or weather checked. That in itself is worth quite a bit, with the price of new tires in todays world.
Here is a lube chart for an H, and Super H that might help you out on drain/fill locations, and the amount it takes. It also shows lube points for grease zerks. If you plan on keeping it, or just not sure about working on these older tractors, I'd suggest getting an operator's manual, and service manual. An I&T brand service manual would be the least expensive. Not the best, but will give you specs for tune-up, and various adjustments. An Op. manual will give you a lot of info on periodic maintenance. I've found ebay to be a good source of buying manuals.
Here's the lube chart. If you have a printer, after opening the attachment, you can print it off to a full sized sheet of printer paper. Handy to print off, and put in a service manual.