Jul 14, 2013 - 05:43 PM
Not sure which transducers you are referring to or what kit of test you want to perform.
Mr. Thornton is comparing some transducers in this AVI video, but uses mainly two in the case studies he presents (one at a time): the Fluke PV350 and the Pico WPS500. For in-cylinder testing, one transducer is typically sufficient.
A vacuum tranducer like the SenX FirstLook can compliment the in-cylinder transducers when testing for mechanical engine failures.