Where to pick up RPM's
 

Ok, where is the best place to put the RPM clamp on the 24 valves? I was talking to a guy i know whos got a dyno, and he said he was having trouble pickin up RPM's on a guy's truck he was runnin. I wouldnt mind him runnin my truck also to see what im puttin out, so figured i would ask... We were thinkin cam sensor?? Thanks guys!

Brad