One end goes to the vacuum pump, one to you transfer case, and one runs across the firewall under that rubber trim to the HVAC.
You can see it here on my ‘98.5 zip tied to the wiring harness.
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I can’t help you there, I don't have the truck anymore.
That tubing gets so brittle it will break if you look at it hard. You can get some air brake tubing and vacuum hose at the parts house to replace it all pretty cheap.
You can buy the entire under hood vacuum harness off Amazon and probably other places for pretty cheap. I replaced mine last fall. This is an OEM part and guessing it must sell a lot since they are still in good supply. Easier than building and splicing, it just all plugs into.
You are welcome.Thanks Shelby! I will need to look up my Chrysler number.