Possible to test that it is working well back and forth if you apply 12V (pins 1,2,3) and ground (pin 4) on harness to activate electric vaccum pumpas specified in the service manual section EL-108. Look for a good looking one but to cheapest price because car is going to be stored for winter time. Have many TT and NA engine parts available to exchange if you need something Thanks for reading
Follow Ups
TT cruise control actuator with wire up to throttle linkage - qcsolo20:08:57 10/31/05