If your running Spektrum try a stutter stopper.
As for a speedo getting shipped to you I'm sure they will send you one but as of right now they don't have any in stock. I just talked with them on Friday evening and they are roughly 5 weeks out to get them all back in stock.
Have a link to the stutter stopper? I might try one in my VTA car, still getting a slight stutter on occasion.
As for the five weeks that sucks but at least I ordered a Sidewinder to hold me over until I get the new one.