Tachometer and Coolant Gauge Don't work

[Mangrum84]

My Speedometer and my Gas Gauge work perfect. This problem has been active since I purchased the Car is February. But when you smack the Dashboard both Gauges jump for a hot second then back down to their inactive state. Any Idea why this is happening?

[nando]

bad grounds on back of cluster. possibly corrosion on the pins or cracked solder joints.

all pretty easy to fix.

[Mangrum84]

Thanks Pal. Any Idea on how I could take the Cluster/Dashboard out? Like a Step by Step Guide or just just basic Guide for the Cluster