Hi there.....I have a Bosch airflow meter which i took off my car and changed for another unit. It didn't seem to make that much difference to my problem (the usual dodgy tickover and hunting problems). I have took the top off (looks like its been done before and resealed) and saw lots of weird and wonderful things inside. I noticed that there is like a set of contacts which actually meet together, a spring mechanism that has a needle that seems to run across a pcb board and a dial/cog that looks fixed by a spring. Just wondering should contacts be touching and should the needle be scrapping across the pcb.