[Vwdiesel] new N/A Injection pump question

[S Boser]

I was wondering if anyone has recently purchased a new bosch injection pump? I bought a 1981 Rabbit from a friend last week, the old pump starts to spray fuel from the front injection pump seal above 3000 rpm.
I purchased a new pump locally and haven't yet decided if I want to replace the seal on the old one or just install the new pump.
The new one is interesting as it has no cold start valve. It also has a funky piece on the side facing the radiator. There is a terminal for connection to 12volts. looks like a valve. (I'm thinking maybe its function is like the old solex pict28 carb electric choke) Otherwise I'm Not sure what its purpose is or how I need to hook it up. Anyone familar with this? The guy at the parts counter says this is the replacement for N/A diesel pumps.

Thanks Steve