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A-Team Performance Coolant Temperature Sensor Water LS Engine Swap M12 1.5 Adapter to 3/8 NPT Fittings Compatible with LS1 LSX LS3 179
Coolant Temperature Male M12-1.5 to Female 3/8" NPT This adapts SBC and BBC 3/8" NPT coolant temperature sensors to fit LS cylinder heads. Compatible with sensors with up to .85" length, measured from probe tip to the outer edge of the adapter.
Most aftermarket gauges will use a 3/8" NPT thread adapter (usually included with gauge)