For Ralf B:

You really need the entire manual for the Vision 1000 unit since it has the wiring connections as well as the explanation for the operating functions.  I don't know the name of the firm that took them over but if you go on line or call the old telephone number, you should get a referral.  If all else fails, contact me and maybe I can get you copies of the important stuff.

BTW, I really like the unit but I mounted it low on the left side of the instrument panel where I have a hard time reading the numbers except when sunlight hits the panel.  I had to mount a light on my armrest to read the panel so I recommend that you
plan your installation accordingly. Regards, Bill Hogarty