I'm installing the Bosch FGK2 kit on my 76 240D. While looking online, I don't find a reference to the glow plug relay on the MB's with the gorilla knob.

When installing this kit on the earlier models with the gorilla knob, is the relay necessary? Is there even a glow plug relay on these vehicles, and, if so, where is it located? I can find some relays that look similar to a glow plug relay, but I'm not sure which it is.

The Bosch FGK2 includes:
Bosch Duraterm Glow plugs p/n 0 250 201 044
Bosch Relay 0 281 003 005
Wiring harness
The kit p/n is either FGK2 or 0 250 201 955

Thanks for the help.