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tis completely normal mate, i've had it on 2 of my td's now! it stops as soon as revs pick up but rattles and buzzes on tickover and low revs.

its something to do with the way the td's make boost, it pulses at low revs or summit.

However - to cure it, apparently you gotta fit a tee piece in the pipe between the inlet manifold and the guage, then blank the end of the t piece off. that way it acts as a plenum and stops the vibrations??

i've never tried, as i just ignore it, but apparently it works :D
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