Steve019

As PEH mentioned you will have to get rid of the old resistance wires connecting the old plugs AND the copper ground strap, connect the new plugs with the new wires (you should replace the old 50 amp fuse with a 80 amper also) and fire it up using the old relay. This is assuming your new plugs are 18mm. I could never find adapters as PEH referred to but you can get the series plugs in 18mm. Both kits I got included 18mm plugs. If they dont fit in the hole you will have to send them back or find the adapters as after "79' the GPs were 12mm.
These series made a HUGE difference in how my daughters car started in winter. I did not change the relay in her car and in my wifes 240D I use a push button and solenoid , which takes the place of the stock relay. One less thing to go wrong You will really like the new plug sustem

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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"