No ABS light coming on (does checks when ignition on then goes out) - speedo was intermittent to start now nothing at all.
Checked resistance of the four ABS sensors at the ABS ECU plug and three are 1.407k but the rear right (speedo sensor) is 1.394k.
Didn’t think the slightly lower resistance of the rear right wheel sensor would be enough to indicate a problem with that and as I said no ABS light is coming on. I’ve even gone as far as to swapping the ABS ECU control unit in case there is something up with how that is processing the signal from the right rear sensor and converting it to the signal for the dash, but that made no difference.