[Gilles]

When I replaced the face gauges on my Cayman and pushed the needles too far into their shaft, therefore the tach needle was acting the way you described, a repair shop told me to install the needle at the bottom of the scale (0..) and "push it Not all the way in" so does not drag against the face cluster, you may want to give it a try..

PS: push the needle all the way in, then pull it up a couple of mm