You just selected:
Code Gecko
9916-100094
OVERLAY: TSC-4-GE1
Overlay for TSC-4 or k-4, 8 keys: 2 pumps, blower, light, economy mode, temperature up and down
You should also consider these companion products:
Code Gecko
0201-300014
BOARD REPLACEMENT MSPA-MP-GE1
Code Gecko
0201-300045
BOARD REPLACEMENT KIT FOR MSPA-1 AND MSPA-4