Go to AerexAvionics.com to learn about the Fuel Flow Interface used on the C-130 and other platforms for many years to access the fuel data from the fuel flow transmitter to the FMS. The Interface converts the 2nd Harmonic to DC or AC Linear for the FMS to receive the fuel data. Copy of the STC included in the install manual with a one time use agreement. DERCO is a distributor of the unit or MROs can contact Aerex directly. Hope this helps with your modification research.