Understanding transport is important for creating reliable predictions of plasma performance in fusion reactors. Plasma turbulence causes much of the transport seen in present experiments. Gyrokinetic codes can simulate turbulence and turbulent-driven transport. Further verifying and validating these simulations are needed. One class of tests is provided by electron density fluctuation ñe measurements using techniques such as reflectometry and beam emissionspectroscopy. The GYRO gyrokinetic code is being used to simulate turbulence and turbulent-driven energy, angular momentum, and species flows in experiments. GYRO can generate the timeevolving fluctuations of ñe in three spatial dimensions. From this, profiles, along the diagnostic lines-of sight, of the root-mean-square ñe , radial correlation lengths lr, and power spectra can be produced. This paper focuses on GYRO simulations of reflectometry measurements in TFTR and JET. These are the first published nonlinear gyrokinetic fluctuation simulations for either tokamak.