Geeze. I have never seen that before, or heard of that. Sorry. 

It also stalls out when I am at idle and push the clutch in

Hey Wayne, sorry to hear of your troubles.  That is a first for me too.  I have never seen nor heard of anyone asking about the needle dropping to zero while driving when the RPMs do not change and then bouncing back to "normal".  From everything I have read it is bad news when it drops to zero but that is when the needle stays there.  In your second video, what did the needle do once you put the car in gear and drove?

Copied and pasted this from m.net but still stumped as to why it would drop and then bounce back (in your first video)

NC OPG

Have you happened to double check the posts on your battery terminals?  I ask as I have read where if they are not seated properly on the terminals (which are tapered) then they can slide up causing issues even though you swore that you tightened them down properly.  It might have also happened to me once after I dis-connected the battery when installing my head unit.  😜

@ctt3mx5 

at this point I’m 90% believing it’s the connection at the battery; but my problem fully believing that is why is only the OP gauge affected; and why does the engine sound weird when it pegs at zero?  Also, why stall when I put the clutch in at a stop?

Marty at Big Daddy’s Garage in Schnecksville got me going again. 

oil pressure switch was the culprit. 

Well that was a quick fix!!!!

Posted by: @dudester7

Well that was a quick fix!!!!

My favorite kind.  Having the video was the best thing I could do so he didn't have to try and duplicate what was happening.

Happy to hear that it was a quick and easy fix for you!