All three were working fine. Went to take the car out the other day and noticed all three magically weren't working. I have been looking into possible causes and keeping seeing it's probably the VSS? Any other guesses? I also have a fuel guage that quit working many years ago. Not the sending unit as I had a new one put in. Any ideas on that as well? Thanks in advance!

 

You're on the right track - VSS, buffer, connections, power.