Looking for some guidance from you lovely, knowledgeable lot.

My digital display doesn't function as the manual suggests. The 'mode' button works fine but the 'reset' button doesn't appear to do anything, but my biggest issue is the 'gear indicator' isn't showing. This is a real pain as I need to constantly count up and down as I'm shifting through the sequential box.

Has anyone had and more importantly remedied these issues?

I have the same clocks but without the gear indicator.
When I fitted mine the buttons didn't work as should.
I had to dismantle the clocks and clean the contact points on the circuit board.
As for your gear indicator. Have you checked your gear position switch and connections. It's around the output shaft. The position switch can wear out and get gummed up.