How do I add a reference object's angle to another object without getting an infinity loop??

I have a needle, or object that is pointing to 0 degrees that equals its rotation on the Z axis. The needle's angle can vary depending on what is going on, so it needs to be referenced for my script so the visuals are correct.

I have another object that is rotated to reference "power". Reference hColl.

I want to add the two values to display on a gauge "torque". This is TorqueNeedle.

The problem is when I add the needles' transform.rotation.z to "power" the needle rotates faster and faster and never stops.

I want to add the two values together to get a whole number. Any ideas? Script I am using is below. colAngle = -HelicopterControllerScript.hColl; TorqueNeedlePreviousAngle = TorqueNeedle.transform.eulerAngles; float newangle = TorqueNeedlePreviousAngle.z + colAngle; TorqueNeedle.transform.localRotation = Quaternion.Euler(0, 180, newangle);

The real problem is that I have another script that controls the animation of the TorqueNeedle. Its angle can vary from 0 - 45 degrees. This is the reason I cant just add the value hColl to the rotation.

The math just goes into an infinity loop, and the value exponentially increases.