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Hello, are you still looking for answer to this question?
Can I ask why you want to check the vacuum?
Ok, sorry I didn't get back sooner.
Which engine do you have in your truck?
If yours is the 6.2l I have attached a picture showing the vacuum lines.
#2 on the drawing is the vacuum hose that you would have to cut and install a tee fitting into to install a vacuum gauge
Here is the drawing.
Ok, sounds good.
Did you find it?
Can you please rate me.
You are correct, the orientation is backwards. I believe that those hoses are actually on the rear of the intake. If you look close it appears that the throttle body attaches to the far end of the drawing.
I hope that helped.
Please let me know.