I have a 2005 dodge ram crew cab and I think my oil pressure sensor is bad. my gage drops to zero while driving,but my warning light does not come on.

Change the sensor. it appears to be a known issue.

https://www.autopartsrepairs.com/causes-low-drop-oil-pressure-dodge-ram-trucks/

Durango

https://dodgeforum.com/forum/1st-gen-durango/276936-oil-pressure-gauge-drops-and-rises.html

https://www.google.com/search?q=%2799+Dodge+Ram+1500+5.2L+Intermittent+sudden+drop+of+oil+pressure

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Try using a cheap mechanical oil gauge to make sure you do have oil pressure. If you do, something is preventing the senders from making ground to the engine. Are you using tape or sealer on sender threads? DON"T. the threads are the ground for the sender.

The oil pressure gauge tells you how much oil pressure the engine has, not how much oil is in the sump.
Sounds like the new oil pressure sensor is the wrong one, or there is a problem with the gauge on the dash. There are two different sensors, one for a gauge and one for a warning light.

Might be a bad Oil pressure sensor or a weak oil pump and when the car idles the pump even if it spins but the power is low but after you push the Gas then the RPMS goes up and the pump spins fast the pressure gets higher. Good luck

If the valve lifters are quiet you most likely have oil pressure even with gauge showing "0".Sounds like the oil pressure switch going bad.I would try that first.

Hello
You have a bad speed sensor located on top of the rearend of your truck. If you dont fix this soon it will give you more probloms. yes this is needed
Thanks

I would replace the sending unit. It is an easy and cheap replacement compared to solving low oil pressure issues. If you really had low oil pressure than you would have heard noises like lifters clicking, rod knocks, etc.

Just to add, hope this helps with sensor location. The spec I saw was 30--80 psi oil pressure at 3000 rpms. In the old days they used to say for generic spec, 10 psi for every 1000 rpms. Always use the proper spec. You might be able to use analog pressure gage to screw in to replace sending unit to double check oil pressure. Just my opinion.

if it is electrical oil pressure sensor I would start there. The best way to see if you have a major problem is to use a mechanical oil pressure tester. Take off the oil pressure sensor and put the mechanical tester on. The tester should come with a Gage. If it comes within your trucks oil pressure range than all is fine and replace the sending unit and see if that don't help your problem.If the tester runs high then the oil pump is bad or your cam-bearings could be the problem. But with cam-bearings you would usually get a low reading.

yes they can and no i wouldnt drive it