Major Leak at pressure gauge inside my well house
Buy a shoulder nipple and an isolation valve when you pick up a new pressure gauge. This will make future gauge changes easy. If it's an oil filled pressure gauge add a 90 degree street elbow so gauge sits upright. Then cut the vent on top of gauge or it may read wrong.
Whatever type of gauge you buy, shut off the isolation valve and open only when you need to check pressure. The gauge will last much longer when it's not subject to fluctuations in pressure.