Flickering rev needle !!!

[h3rbi3]

Can anyone give me any suggestions...my trusty 1993 4 ltr pre serp chimaera has decided to develop an unusual trait in that the rev needle is flickering when being driven, it does settle down some times and the needle moves as you accelerate but gives you a reading of +/- 500rpm not ideal...any suggestions at what i need to look at to resolve this,,,
cheers in anticipation

[miniman]

I'd start by checking all the connections on the coil, might be a loose wire.

[h3rbi3]

checked the connections on coil...no change !!! any new suggestions will be gladly recieved...cheers

[Symonab]

Most likely one of the HT leads from the coil is running too close to the wire off your alternator which goes to the dash give rouge readings. Re-routing will resolve.

[thegman]

i found i also had this problem when i hit 5000 revs and 140 mph.

[Chris Smith]

thegman said:

..... and 140 mph.

Well done Sir!

By then you're not worried about a flickering rev needle, more the flickering bonnet!

[thegman]

didnt notice actually. car was still pulling like a train but i became too scared that the roof was going to fly off.