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What the previous shade tree mechanics did or did not know is not important. What is important is that you know what you're doing. Purchase the assembly instruction manual (AIM) and GM Chassis Service Manual for your model year. The AIM will show you how the cars were assembled, list the factory parts, and list the original factory part numbers. The chassis service manual will be helpful in making your repairs and troubleshooting.
Purchase a reproduction owner's manual and read through it. There is a lot of valuable information in the owner's manual.
What they have in common are drive cables. Both of yours (speedo and tach) are disconnected or are broken. The odometer is part of the speedometer head. If the speedo is not working, the odometer will not work. Odometers can also die on their own, so you might get the speedo working again and still have an inoperable odometer.
Could also be a blown fuse; poor ground; flasher; or, the turn signal switch.
Could be a bad horn relay; bad horn contact. Could be 40 year old horn wiring. Have you tested the horns?
You will need two replacement switches. The AIM shows the installation in the ebrake console.
The AIM has assembly diagrams of the interior, including the center console, shifter plate, ventilation controls, etc.
Purchase two or three of the Corvette coffee table books. All of them will have interior pics. Dr. M. F. Dobbins has two C3 guide books showing tons of stock interior photographs for various model years. The first volume covers the 68-72 model years; the second volume has 73-77. They are good reference books.
Could be a fuse or a relay. Might be the actual switch in the bezel. With the wiper door removed, it is likely to be the wiper switch on the cowl.
The ventilation contol in the console trim plate has to be grounded. If your console is gone and if the trim plate is missing, you lost the factory ground for the ventilation controls.
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