5.7 hemi oil pump problem?

I have an 05 ram with the 5.7. One day I started it and no oil pressure. Checked oil level and it was good. Found it was the oil pressure switch, replaced it and it's fine 5 years later. It seems like it was a chronic problem with that oil pressure sender on a lot of hemi's. That gauge on the 05 is either 0 or normal pressure, not really a pressure number gauge. Again as mentioned in previous posts have stated, try a mechanical gauge first before tearing all apart. I'm not sure if they ever put a true pressure gauge in those motors.