I was disappointed to received this e-mail reply from Clark Electronics:

Hi, Richard

As you know, EE system of HL Tanks is getting better and better, we believe
HL will have a controller similar to our ESC116 and CSC116, therefore, our
1/16 project is freezed. sorry for that.

regards,

Clark

On paper, the Clark unit looks pretty good. I was hoping to use the Clark unit to upgrade non HL tanks.