Fuel flows not matching
 

Replaced the fuel pump on the aft engine and set it up using a calibrated porta-test unit and SID97-3F. Metered fuel pressures are the same for both engines (18psi), Unmetered at 600rpm 8.4psi front eng. 8.0psi aft engine. Unmetered at 2800rpm 24.6psi front and 24.4psi aft. Aft engine gauge is reading about 25 lbs/hr higher. Cleaned aft engine fuel injectors which did not help. Anyone have any thoughts. These are normally aspirated engines, IO-360-CB.

Gauge needs calibration or overhaul. They get gunked up from time to time