There will be a check valve that also acts as a splitter near the firewall. It is yellow and has one nipple going into it and has two coming out toward the firewall. Both lines coming out and through the firewall will be yellow and one will have a stripe. The plain one goes to your door locks and the one with the stripe goes to the vacuum reservoir under the back of the car. You will need some sort of check valve in place if you want to keep using the reservoir, but you will not really need the reservoir if you are not using the door locks at all. You could just take a golf tee and plug the line that goes into the check valve. I hope this makes sense and helps.

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1985 Euro 300TD Turbo