'81 300SD-No Cruise Control

[jonnyo]

I replaced the actuator (003 545 86 32) and still no Cruise.
If the Tach doesn't work will this prevent the Cruise from working? (I replaced EVERY bulb in the Tail lights with Jahns bulbs, btw)
I had previously replaced the RPM sensor (001 545 59 32) with no help in the tach working.
Now, mind you, I do work for a guy who's a GREAT Benz mechanic (26 years with them) but there's only so much help I can pester him for. We're so swamped with PAYING jobs (had to hire another mechanic just to keep up with the load) that I can't bring myself to burden him with trouble shooting THIS, on the car he advised me not to buy-the300SD, anyway.

I run this shop-save most of the actual wrenching- andI get all my car parts at shop cost-not just a discount (saved THOUSANDS...so far in new parts getting this to where I'd like it, if I were just a guy off the streets) so I try not to push the envelope.

Appreciate any tips or thoughts.

BTW, if there are any guys out there without parts connections, in the S.F. area, email me and I'll see if I can help.

Thanks,
FJ