S13 Cluster Not Functioning Correctly

[Zapiel]

I got a s13 hatch 240sx recently off a friend and it seems the cluster isn't working properly. The gas and rpm reads fine, but the temperature and mph only reads sometimes. I was told the engine was recently rebuilt and the ecu was reprogrammed/tuned. Is this a common issue? If so, how should I approach this? I never dealt with this so this is new to me.

Thanks.

[Sileighty_85]

Its either Faulty wiring,Sensor,or gauge.