I don't need this anymore so I'm offering it for sale.
Uses optical encoders and runs on either 2 9 volt batteries or 12 volt through external power source.
Inludes everything in photo.
The only parts missing are a modified hub and encoder shaft collar.
Your existing hub can be modified easily and a new collar can also be easily made. It should fit any older 8" Celestron SCT.
I have a larger image of the hub and collar if interested, just email me.
Price is $85.00 including shipping.