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Coolant Temperature Sensor

Adding fuel injection requires the addition of a coolant temperature sensor. The installation can be done is a couple of different ways as shown below.

The TR6 thermostat housing is British straight thread rather than the more common US tapered pipe threads used in today's cars. Fortunately the British thread is nearly the same size but a tad smaller than US 3/8" pipe thread, making the conversion pretty easy. Just below the thermostat, the hose nipple on the passenger side was removed. The socket was tapped to US 3/8" pipe and a 3/8" brass street tee (NAPA WH 3750x6) threaded in. Use thread sealant and be careful to not overtighten the fitting as itís wedge shape can split the housing. The street tee is male on one end, female in the center and female on the other. A Ĺ" hose barb with 3/8" threads (NAPA BK 660-1503) was screwed into one end and the sensor screwed into the center of the tee. A GM style coolant temp sensor is threaded into the tee and the small coolant hose reconnected. This is another task that can be done prior to the TBI conversion
In this instance the customer decided to mount the sensor upside down directly in the hose. All that was needed was a a 3/8" NPT Tee and two  3/8"x1/2" barbs.

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