Onan 2500 LP Generator Acting Up (again)

Here is also my 2 cents. Mine starts but turns off as soon as I let go of the start button. It was doing intermittently for about a year. It became more frequent. I was going to check the oil pressure switch but I read somewhere mine does not have oil pressure switch. So I brought it to a local Onan repair facility. I was told magneto seemed to be bad and will cost me almost $1,000 to replace it. I asked about the oil pressure switch and the guy told me there is no oil pressure switch but there is oil level switch...??? I told him to disconnect the switch and test and I was told he did and it didn't run. I searched internet for a used 2500LP and it was around $1,000. Told them to change out magneto and also asked them to disconnect the oil level switch just to make sure I don't get stuck in remote area with bad oil level switch. I paid close to $1,000 for the job and took back my RV. Upon returning home and running for a few times over a few days, I reconnected the oil level switch just to see if it still runs. If it runs, then the magneto was bad, right? Alas! As soon as I connected the oil level switch, it was doing the same thing again! This proves the problem is the oil level switch, not the magneto!!! I was really disapponted at the outcome! I don't know what the shop was thinking when I asked if they tested the oil level switch. It could've been a $50 buck job, simply disconnecting the oil level switch, and now I wasted $1,000 and back with the same thing. I disconnected the switch and it starts every time now. I was thinking to challenge the shop but I remember him saying there could be other problems that will cost me another $1,000. After pondering for a few days, I decided to bite the bullet and not go back to the shop. If they can tell me a lie like this, I am sure they can do more. At least it runs now but I need to check the oil level once in a while. I read in many posts online with the same symptom. Try disconnecting the oil level switch first before you do anything.