Question on Viewing Oil Trough Oil Level.

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Guys, 
I've been working on my 29 exterior, interior, wheels, etc. The engine hasn't run has since last summer, sitting on in running stand ready to be put into the car. I was cleaning the engine off of dust and doing a visual check as part of getting her ready for a startup.

I noticed the red top'd oil gauge which was about 1/2 inch from the top of the glass last summer has risen into the screw cap of the glass and become invisible. I was wondering if the troughs had drained into the sump. Trying not to remove the sump pan unless I have too. Is there a way to use a pipe scope to look at the troughs for sufficient oil levels. I know the trough pan develops holes.

Thanks for any advice

Jack