I've seen repeated Autometer guage failures. I won't use them. I've got one in my '03 that's stuck at 5psi at the moment, and it's not even plugged in!!! IT was a warranty repair to replace the customer's I had to repair after 3 weeks, or it wouldn't be in there, either!!! I just couldn't resell it for fear it would fail, and guess what?!??! It almost made a year... . Replaced the customer's with Isspro and had much better luck... .
On hesitant pedal, did you run codes?? It could be bad APPS..... just a thought... .