I’m not sure if the Bluetooth version has the rpm stopwatch feature ? I just looked at my App and didn’t see it. My earlier, PC plug-in version has that feature.
Ed
Considering how the O-ring on an automatic's speedo drive is a massive PITA to install correctly (they almost ALWAYS leak afterwards) all that RTV probably worked pretty good.
Ed
Never seen them sold separately, but I try to keep my old ones; I'll see if I have a set in the parts stash...
They certainly help keep the bottom of the insulator from getting cracked/broken.
Ed Z