Darell, location of your additional sensors are located above location with present add on
shut down switch. Location on sender inbetween secondary fuel filter and Heui pump on
Left side of engine looking from back to front. ( inline with bottom of filter ) next sensor
Location same side of engine along front of engine ECM about 3 inches. What You have, the
first shut down sensor on 1/4 pipe tee is the mfg add on and not Caterpillar OEM
Dave Atherton Retired Cat Mechanic