If you change that vacuum switch be careful and make sure the hooked part that goes inside the IP is HOOKED. A run away engine could spoil a nice day. One easy way to check this switch is to disconnect the vacuum line and then apply vacuum to it (suck on it) and if the engine quits then the vacuum switch is doing its job and you have a vacuum leak to find.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"