Okay, a long long long time ago (actually not that long ago)~ I bought a used C&L mass air meter with the aluminum inlet pipe.
Where is the sample tube exactly and what does it look like?
Im starting to wonder if i even have one in my meter?
You should have one. It's inside, looks like a tube. The device which actually takes the readings is housed in it. Not sure how you change it though...
You may have a problem then. C&L's are finicky anyway, you wouldn't want to use it without one. They are pretty cheap (around $20 I think?) so just order the one you need first.