Yes MSD wires are the best you can buy for a MK3.
Look closer and you will see that the 1G shares another part with non-turbo 7M's, that would be a distributor. No DIS ignition system there. That hinders performace likewise, no wonder the engine was only rated at 210hp with twin turbos
So I would guess that you would use MSD wires for a non-turbo MK3. Because "turbo" 7M wires will be too short because the coils sit directly on top of the spark plugs and you need them to reach over to the distributor.
6 to 8 what? Bar? If its bar, then holy shit you have problems there. Thats like over 80psi. I don't know much about 1G's, but I know enough to know your oil pressure is too high.