Well the speed sensor is in the tranny, and can be disabled by simply un-pluging the connection.
I'd be asking my self if I could trust the person selling the car? Second 160k under power or under tow is still 160k worth of wear on the drive train parts (except engine), hubs, spring, gears, axle's, oil seals etc!
Check to see if there are signs of a front tow bar ever being on the vehicle, there should be visible signs, brackets, extra non factory holes, wear spots etc! on the front frame area under the front bumper, if there are no signs of it ever being towed, assume it wasn't.