running it for a few minutes won't do much for you...
Buy a battery charger. They aren't that expensive. You can even get ones with auto shutoff or auto trickle for under $30.
Running it will stir up the coolant. Coolant will separate if left sit. Once that happens the cooling system is in danger. Even a short run will help here but that's the only thing a short run will do good for.
Question is how long can you run it... You need 15-20 minutes at least, preferably longer, to really get the battery fully up and to get the engine hot enough to drive moisture out. If you don't do both, running it could actually do more harm than good.
Problem is you can't run it long w/o a fan for the radiator. Depending what motor and the air temp, it could over heat in a few minutes. If you have AC power near, you can use a fan from the house to move some air. Any air is better than non. If the hood is open/off it will also help.
You can run the engine ok without gauges but it's a bit dangerous. If you are low oil or high temp, you won't have any way to know.
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RIP Crew of Columbia. 01-Feb-03