Sorry as this is likely a simple item. I see the low side right in front of the brake master cyl. Not having much luck seeing the high side port. Any insight please?

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1996 E300D
1996 E320 Wagon 4MATIC
2003 Jetta TDI- GLS, 5-spd
1997 Passat TDI
2002 F350 Crew cab 4x4 Powerstroke
Jacobsen HR 15' cut ZTR w/ 80 HP Perkins diesel
Hustler 6' front deck with 28HP Kubota diesel