Oil cluster at 70Psi

[rafael805ox]

I have a 2002 Chevy Tahoe rebuild motor.
When I turn the key too ON position, the oil psi is at 0. When I turn on the car it is at 70psi. Whenever I drive it it moves closer to the 80psi but doesn’t fully reach too it.
So my question is, do I need to replace Oil Sending Unit or Cluster ?

 

[dadwagon95]

Good question... Maybe something in the circuit if the oil pressure sensor reads 0 before you crank the tahoe i wouldn't think it's in the cluster otherwise itd be off constantly