I have attached a pic I found on the web. The thing in the red circle is attached via some linkage to the throttle, but on my '82 300TD this thing is not connected to the linkage seen below. Can anyone tell me what this thing is and do I need to get it connected?

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That is the servo for the cruise control.

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)

So I guess my cruise doesn't work...Is it a problem to leave it unconnected? Does anyone know if any reason why it may have be unconnected in the first place. This car is new to me, I am trying to figure things out as I go.
Thanks.

I am not aware of any problems- 2l of mine are non-functional and disconnected

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)

usually the cruise amp under the dash goes out, and it's difficult to get replacements, so most just disconnect it when working under the hood, and never hook it back up. you can open up the CCA and re solder the connections, but it's a crap shoot.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
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My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!