Hi Chad,
Here's the diagram for the Harvard Mk 4 right out of the manual:

And here's a photo of the lower panel on Harvard 20304, which had been in storage since 1964!

So from left to right we have:
- the box containing the 'fingers' indicating flap and gear position, as well as the landing light switches, gear locked indicating lights, and gear horn cut-out switch
- the oil cooler shutter operating knob
- placard holder (compass?)
- parking brake
- 'Max diving speed...etc' placard
- Parker engine primer
- two more placard holders
- engine fire extinguisher placard/pull handle
If you need higher-res shots let me know. I took a ton of photos of '304 before we disassembled her since she was a time capsule.

Shane