
The TP800 topside panel has been discontinued. The recommended replacement is the TP700, which will fit in the existing hole (the rear of the both units are the same shape) and operate just as the old TP800 units did. The only difference is a slightly different button layout.
Here is a link to the TP700 replacement for 3 pump systems:
Balboa - Topside Control Panel, TP700, 11 Button With Overlay - CTP-TP700-2, G8470+17381
Here are links to the TP800 replacement for 2 pump systems:
topside panel: OP33-1103-08
overlay sticker: OP11-1104-11