I know of no one who "collects" this type of equipment. People in this hobby might have one of these in their collection, if it came free, but I know of no one who is looking for them. I have 100s of ads for this type of equipment but have yet to sell one of them. My suggestion for you is to become a collector of test equipment, someone needs to preserve some of it.
Jack Sim
Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at
www.gaspumpbible.comAir Meter ID book also available