Only 12 "Franklins" ?
I'd be all over it!
The Drive Sprocket for both the Vacuum Pump and the I.P. is Also the "Timer".
You can remove it without taking off the I.P.
This'll give you an Idea of what you're dealing with.
start here:
http://www.w124-zone.com/downloads/MB%20CD/W124/w124CD1/Program/Engine/602_603/07.1-8014.pdf
Complete FSM:
http://www.w124-zone.com/downloads/M..._603index.html
DAVE'S (GSXR's) "Website" is a Godsend of Info!
http://www.w124performance.com/images/