My 83 Porsche 928 has this stuff on it. There is a multi pin connector on the side of the fuel head/distributor, and a solenoid in the pipe going to the WUR. When I got it, it was very bad at hot starts, but would clear ok after a few hours standing. Then I found the electrical lead with the plug hanging down beside the motor, and looked for somewhere to plug it into - distributor! After that it has been fine on hot starts, apart from a bit more cranking than when cold. My Bosch application chart doesnt list part numbers for these bits though......nor for your model
hth
jp