You don't need it. Just use the #1 injector line as the drip tube. If you let it drip just to the left of the injector, it's all uphill for the fuel and it will give a good indication of the timing.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL