Tacho problem

[02gzm]

I just noticed on the way home from the city my tacho wasn't working properly. It idles fine but will only move to about 1500-2000 rpm when i know the engine is running a lot higher than that. When it hits vtec though the tacho jumps straight up to about 7000rpm. Anyone able to help?
Oh the dizzy was replaced a few months ago and the ECU didn't throw any codes either.

[CRXer]

check the wiring plugs on the dizzy are coupled together properly,sounds like a loose connection somewhere.

could also be the connection of the wire onto the ICM inside the dizzy,pop the cap off the dizzy,unscrew the rotor button & then take off the plastic cover & u will see the thing with 4 wires connected to it.make sure the blue wire(could be faded to a green colour by now) on the side of the ICM is conncted well.

[02gzm]

Took the car down to ivan and he said since the car is running fine it may be the tacho itself. Has anyone around bris got an EG cluster with a tacho sitting around that i could borrow for a few hours over the weekend to see if it is the problem?

[02gzm]

bump

C'mon someone's gotta have a cluster sitting around somewhere.