Disrupted tach after battery change

[gatorbaitor]

Recently I took the battery out of my 2012 Genesis 5.0 R-Spec to charge it. When I reinstalled the battery several electronic displays appeared not to work. Specifically the tach and fuel gauge don't register and the air bag warning light is now on. The manual says to reset the features as shown 'Section 4'. Section 4 does not say anything about resetting anything.
What have I done to the car and can I fix it?

 

[Ron5.0]

Still having the problem?

Try doing a cap discharge, not 100% it will work but it might.
Disconnect your battery again, connect both terminal of the car together with wire for about a minute, reconnect the battery.

 

[PMCErnie]

Okay, I'll bite. Why was it necessary to remove your battery to charge it?

 

[gatorbaitor]

The car sat in the garage over the summer.