my egt gauge has been weird lately. I know nothing is mechanically wrong with the car, as my wideband is ok and there is no knock at wot.

the egt gauge wobbles back and forth ultra fast. when i first start the car in the morning, its steady. then as it climbs up to around 6 is wobbles between 600 and 800 degrees. when i say wobble i mean the needle almost vibrates between the two numbers. i got on it last night, and got up to about 1200 degrees on the egt, and it was steady. i thought that fixed it, but when it got back down to 800 degrees or so it started wobbling again.

anyone know what this might be? ive tried flicking and hitting the gauge, and keeping the rpms up high, but no matter what, unless its cold or 1200 degrees or higher, it wobbles. any idea?