For on and off road and towing auto works a treat. While a tad frustrating on big hills that is not the fault of the box.

I have been waiting a few years now for my D1 hydraulic ZF to give up the ghost to then put in a electronic ZF with a view to putting in a Compushift. A great piece of kit that makes a auto unbeatable. Unfortunately i think I will be waiting a while as it is still going strong.

https://www.hgmelectronics.com/display/hgm/COMPUSHIFT

Note ignore what it says it also supports the electronic ZF4HP-22