Old taps rusty?
Well I would use them. I would likely go to the hardware with a tap. Find a wire adapter that fits into my drill. That is long enough and buy about three of them. Then I would buy a couple more sit down and drill out the taps with the wire brush. Then go over the outside of them with the other one. Ending with a nice vinegar water bath.
At end of season do the same we do with our muzzle loaders. Wash them out with a small bottle brush with really hot water soapy water and then rinse with boiling water. Lay them on a dry cloth and the heat from the metal will dry the taps complete so you will not have rust again. Store in a dry place to avoid surface rust in the future. A bed of rice in a bucket with a lid would help keep moisture out.
Again I admit I do things a tad different then most.
43.6728° N Sanford MI.
2015 100 3/16 taps/buckets. 540 gallons of sap = 12 gallons finished. grill side burner (propane)
2016 100 3/16 taps/buckets 315 gallons of sap = 11 gallons finished Turkey Fryer/ grill side burner (propane)
2017 100 3/16 taps /buckets 797 gallons of sap = 8 3/4 gallons finished. Home made brick arch (wood)