electronic csi controller
 

Greddy rebic IV fuel injection controller used to control a frequency valve to vary the control pressure at the fuel head. Uses map and rpm signals along with frequency valve settings to create a smooth A/F ratio throughout the entire rpm range. $550.

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Can I use this with my factory installed Frequency valve used for lambda control? Obviously assuming I eliminate lambda control.

Yes, if its connected between the fuel distributor control pressure side and the return line to the fuel tank your original FV should work.