I first got the Peartune from Ebay ebiketuning.com, don't buy this, it has cheap "breadboard style" connectors. They have stiff cables, don't last in place, and have no water-tightning at all....But, the delimiter hack is a must. You can feel the motor stopping you, almost pushing back on you, ...
I then got the Bikespeed-RS from bikespeed.de, that's what I wanted. Original connectors, 10 minutes work to install.