Insite says turbo spinning when truck isn't running

[tree98]

I installed the new speed sensor and drove the truck for about 5 hours and the check engine light stayed on the entire time. Today I drove for about 30 minutes and all of the sudden the cel went off!! Drove for over 2 hours and light stayed off, I got back to the shop hooked up insite, turbo speed at 0 with engine off!! So it must have been the speed sensor. This is the second replacement sensor on this engine(75,000 mi.) I wonder if cummins got a bad run of them ?? This saga actually started here http://rawze.com/forums/showthread.php?tid=5249
I'm wondering if the factory routing of the sensor cable is to close to the turbo and it doesn't hold up long to the heat?? Although if that were the case we probably would have heard about it by now from other X15 owners/drivers. I don't know but either way I routed it further from the turbo housing this time.