2005 chevy silverado /speedo

[RichSchmidt]

On my 2003 Hd2500 Silverado the Oil pressure guage started reading buried up or down about 2 years ago 55k.The speedo just started doing it about 2 months ago.I noticed it moving kind of clicky for about 2 days,then I drovr past a parked cop and looked down at the speedo and was doing almost 90,but the cars around me were psssing me.Now it reads 120 when sitting in the driveway.I noticed the turn the key trick right away,then I took the cluster apart and manually pushed the needle baqck,and the next day it was buried again.Truck just rolled 90K,I guess I'm screwed.