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Only one that I know of and its where sprostang said.
Yeah I wasn't dure what the one in the head is for, but I do rmember seing one in there when I bought a set of used heads! Also I know on the ealier non-pi models where they had two in the intake (one was for the computer and the other for the dash guage) Wasn't sure if the one in the head was for the computer??? ohh well! Just a thought