R32 Speedo Issue

[R.3.2.G.T.R]

Hi guys,

recently swapped over to tomei cluster on my car,

previous aftermarket cluster was spot on speed however

tomei one is out by 20kms at 100km

have read the procedure performed on r33gtr but looking

for someone who has corrected it on r32

will be changing my speedo cable shortly as needle jumps

around while under 80kms but this happened on previous cluster

as well

any help is appreciated