You can replace it with a long Vacuum Hose or you can replace the Plastic Tube with the same approximate sized Oil Pressure Gauge Nylon Tubing.

The Nylon Tube simply will not be the same Color as the original.

I am not sure if Pelican sells the Tubing by the foot or not. If so you could simply buy it by the OD and the color you want.

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84 300D, 82 Volvo 244Gl Diesel