Holley EFI Coolant Temperature Sensor - TBI SF523 Aluminum construction allows better heat

Aluminum construction allows better heat dissipation and lighter weight

For use with Swivel Seal ™ or Auto Crimp™ hose ends exclusively

540" Gasket BoreSince 1989

735 in OD Steps

STRAIGHT BORE (no taper) minimizes turbulence and maximizes airflow for race applications

Holley EFI Coolant Temperature Sensor - TBI SF523 Aluminum construction allows better heatHolley is quickly becoming The New Standard In EFI! Holley's HP ECU is standard equipment on the 2013 2014 Chevrolet COPO Camaro and Holley's EFI throttle body powers every NASCAR Cup Series team. Top racers are making the switch to Holley EFI every day. Racers like Tom Bailey who set three new records and took the overall event win on the 2013 Hot Rod Magazine Drag Week and John Scali who used it to win the 2013 JEGS All Star race. But that's not