Your system should be a KE-Jetronic system. If you are planning to work on or adjust this system you need to purchase a copy of "Gasoline Fuel-Injection System KE-Jetronic" by BOSCH. You can find it on amazon. After reading the publication (about 40 pages) you will be able to understand what all the post are talking about.
CIS stands for contenious injection system.

MAGV5