My oil pressure gauge has been randomly dropping to 0 and then going right back up to reading half way in the normal range. I let my daughter drive my Mustang Sunday and she said it dropped to 0 while she was driving and stayed there for about 20 minutes and then started working again. I asked her why she didn't pull over and call me and she said she didn't see a warning light on the dash so she figured it was OK. Now it's back to randomly swinging from 0 to normal again...

Need help with oil pressure gauge.