"malunspamwhhit" wrote:

I’m getting a similar problem.

My speedo works for the 30 mile journey into work. Whether it works on
the way home is down to luck. Sometimes it will flicker back into life
for a couple of seconds, sometimes it will work for the rest of the
journey.

I’ve got a speed camera unit in my car which works by GPS. That’s
putting my speed about 5-7 mph lower than the car is reporting
(measured at a constant speed). Is that normal or is it helping to
point in the right location? One thing that might either help or throw
you off track - very occasionally the rev counter will flicker - I’d
say it’s only happened about 3 times in 2 months though.

I’ve been getting conflicting advice, some say it’s the transducer
behind the gearbox, some say it’s the sender unit.

I gave the contacts of what I thought was the sender unit a good
clean, but I think now it might have been the reverse light switch I
cleaned. At least that won’t let me down now! Whereabouts should I be
looking?

Any ideas as to what might actually be the culprit as to the speedo
problems I’m describing? Or am I looking at changing both units? I’m
quite handy with a set of tools, I’m of the standard that has no
problem changing brake discs, alternator etc - I’ve even tackled a
camshaft replacement before with no problem.