so today i was driving and my oil pressure guage like went from normal, down to nothing, then to normal then down to nothing. where it stayed. theres no weird noises or smells coming from my car. do you guys think its just a oil pressure sensor or relay? like a 10$ part? also if i just get a new relay the one thats near my oil filter is it somthing i can just un-plug and plug in a new one? its annoying me not knowing if somthing is broken. any ideas? help would be much appreciated. Thanks in advance.

 

Sounds like the oil pressure sensor. You should be able to change it without a problem.