#33, in my opinion you're being a little bit provocative with that question. The posters on #'s 17, 19, 22, 23, 25, 28 and 29 have all acknowledged or contributed to the body of knowledge being built up on what happens should the speedo wiring get caught/damaged/shorted when being driven. In a road context this means a call to the AA/RAC for a lift home and in a race or track context this means an early exit, and possibly also a lift home. Given road cars are required to have a working speedo we have to live with the risk on the road, but on track the risk can be mitigated by disconnection. How much more of a legitimate reason would you like from the posters listed above and I on this subject?