When it's playing up do you still get instant MPG??
If you do then you're speedo pick up is fine and the fault lies in the clocks somewhere
Steve
P.s, have to have a 460 meet up soon... Mine's lookin' goooood. Well, sort of! Lol
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XC90 V8 Exec, C70 2.4T Convertible, S70 T5 CD, 850 TDI, 2 x Escort vans and a 2.8i Capri.
Clearout has begun, but must continue!