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Return to Parts List Category : L- AR Engineering Products ARE AR438 THERMOSTAT SPACER WITH EFI SENSOR PORT $60.00 AR438 is a spacer which moves the thermostat up one inch to provide room for a fuel injection TX3 type coolant temp sensor. The new EFI kits from FAST and Holley require a TX3 coolant temp sensor but factory water pump housings do not have an extra 3/8 NPT port available. This spacer provides an offset location so the coolant sensor will not interfere with the operation of the thermostat. The sensor location is tapped for 3/8 NPT and the bottom face of the spacer has an o-ring so no gasket is required. The top surface accepts a Mopar style thermostat and must be used with a stock replacement gasket. INSTALLATION NOTE: Please check for any bracketry that may interfere (A/C brackets)