Rev counter dipping

[Chipper]

Noticed our rev counter is sometimes dropping right down, only when on tickover, and it seems to happen more when the weather's cold (OK kinda hard to tell on that...). It suddenly plops down to like 100-150rpm, and sometimes comes back up, sometimes not.
The motor is def idling spot on.

Can anyone point me in the direction of where to look? I take it these are electronic jobbies?

TIA

[BUSHWHACKER]

Could be a loose plug on the back of the instrument cluster or the pick-up sensor is dirty.



p.s. I think the sensor is on the crankshaft pulley, don't don't quote me on that, I haven't got a 3.0 diesel here to check.

[Chipper]

Thanks mate, will have a poke around, ta for the pointers.

[arron]

Noticed our rev counter is sometimes dropping right down, only when on tickover, and it seems to happen more when the weather's cold (OK kinda hard to tell on that...). It suddenly plops down to like 100-150rpm, and sometimes comes back up, sometimes not.
The motor is def idling spot on.

Can anyone point me in the direction of where to look? I take it these are electronic jobbies?

TIA

have exactly same prob on my 2,4 at the mo also stalls now and again with no warning or pattern,?????

[Chipper]

Don't know mate, mine is just the tacho dipping, motor revs stay the same. Hopefully someone will chime in soon, or you might be better with a new post, good luck with it mate cheers.