Hello John and welcome! I'm Billy and i will assist you with this. Feel free to ask if further info is needed.
My apologies for the delay, thank you for your patience.
Straight forward, you have caused some electrical problem (most likely a short circuit) within the gear shifter controls.
The first thing to try now, would be removing the gear shift assembly, and cleaning it, dry it out thoroughly (you can use a hairdryer, to dry out the connectors), or put in the sun for a few hours... and then refit, and hopefully it will work. If not, i'm afraid, it will require replacement.
I will include some instructions and diagrams to help you with this:click here for details
Thank you for your trust! Get back to me if you need more info...Thank you in advance for the positive rating...