Hi Mark, Thanks for the rapid response. I kinda thought the answer was what you said but was wondering if there was a way to do it sorta like when you use the 14mm sensors under the spark plugs to eliminate drilling into the exhaust pipes themselves. I was hoping to clamp the sensors to the pipes rather than drilling them Guess not- Now for another question- Do I need a sensor on every stack or can I put a sensor after the rearmost stack in the pipe going away from the vertical stacks ? Is there a need to have a sensor on every cylinder's exhaust or would one reading per side be sufficient ? BTW I read somewhere on your site about you making the sensors to go under the plugs. I would like to review that again but haven't had much luck finding it. Thanks Jim Litchfield
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