I live in the oldest house in the world - 1861. From what I can tell the plumping was put into the house in the 1950s but I assume the well has been there since forever.
Anyhow - we have had a lot of issues over the past 20 years that we lived there.
We had a plumber out that pulled the pipes out of the well - replaced some parts - did some other fixing and Wonderful! We had the best water pressure that we never had before. Then a horrible rain came and the automatic sump pump in the well pit did not come on and the well pit flooded - knocked out the water for a few days. We turned it off and left it dry out. When we turned it on - the water pressure was low - it pulsated and sounded like it was starving for air. Plus the hot water heater stopped working. It is gas and I could not get the pilot light relit. I replaced the hot water heater - turned the water back on and we still had low pulsating water pressure. That is when we discovered that the pump was turning on and off with every water use.
I turned off the pump - drained the holding tank (it is a bladder tank) - put pressure back in - turned everything back on. The pulsating it gone - but the pressure is still low. It is so low that it will not come up to the shower head.

Here are my questions:
1. How much water should be in the holding tank?
When we drained it only a tiny bit of water came out. When we turned the power back on after draining it - the pump only cycled for about 1 min. not very long.

2. How can I tell what the pressure should be set for in the holding tank?
We were told in the past that it was 20/40 - so I only put 18 into the tank after draining it. Before I drained it the pressure reading was about 25.

3. Should I use the pressure gauge on the pump to know what the pressure is in the tank or just a tire gauge?
There is not a pressure gauge on the holding tank but there is one on the pump that never seems to move, although before I drained the tank it would sometimes jump down to 15 - but it mainly stays at 35 - no matter what it is doing.

4. What other things can I check and clean?
I read in another post about cleaning something that had crude and sediment.

I read some other posts that were helpful - I anxiously await the answers to my questions!