Dealing with bad breakdowns

From your description i would think so.
But they may be more going on or some misunderstandings between you and the service depo

Its hard to say for sure from this far away.
I would like to say its fishy, but having not seen it anything is possible.
I dont want to throw anyone under the bus but it is odd

 

Still 8 weeks is crazy. By Monday morning I can have pretty much anything for a 93 ch mack (yea how many of those do you still see) tell petercar that's unacceptable even 2 weeks is pushing it

 

i replaced the entire engine harness on my truck and i had to order it from mack and it had to be made and i am pretty sure i had it in 4-5 days. it was a couple years ago now so i don't remember exactly but i know for sure it wasn't more than a week. it seems like i ordered it on a Monday and had it on Friday. my truck wasn't down just a bunch of random codes coming and going. so i didn't get it over night delivery. sometimes the dealers can push your parts order ahead of others on back ordered parts if your truck is down.

seems strange that your abs harness would cause all your gauges to shut down. i think i would need a pretty good explanation from the dealer to believe that diagnosis.

 

Older peterbilt harness can have a crazy long lead time. Not out of the ordinary

 

i haven't delt with peterbilt dealers much and certainly not on anything that was back ordered or out of stock, but you may be able to twist there arm and get them to expedite your parts ahead of others. if it was me and i couldn't get the harness for a 2-4 weeks id be going threw the harness finding where it was shorted/broken butt splicing baling wire and duct tape the thing back together and run till the new one came in then replace it.