THANX FOR YOUR REPLY,I FEEL THE SAME WAY,I HAVE MY PROBE IN THE MANIFOLD,HOOTEST READING(AUTOMETER,PILLAR)I HAVE EVER GOT PULLING 16,000LBS 5TH WHEEL UP A GRADE WAS LOW 1300(NO CHIPS)ONLY PROBLEM I HAVE WITH THE PROBE IN THE MANIFOLD IS WHEN IT BURNS THROUGH,OR BREAKS IT IS HEADED FOR THE $$$ TURBO,SHOULD A GUY CHANGE IT OUT EVERY COULPE OF YEARS YOU THINK? AND ALSO I HAVE NOT GOT A REPLY ON MY QUESTION ON THE "WORKHORSE MODUAL" DO YOU HAVE ANY INFO? THANX FOR YOUR REPLY AND TIME!!!