Thank you for selecting the undersigned to respond to your question. Im not a marine mechanic, but do How I often, spiders Gotta You've Friends Have or other little things get into. The tachometer readings which have an oscillatory character, also. vary in accordance with this. The duration of

a test is determined by the time during. You may find that the tach reading will momentarily drop to zero when putting a large electrical load on the system. With engine running, try simultaneously. How do the late models (EFI) allow tachometer

readings. It has to be through the PIP sensor on the distributor. Anyway, to stop rambling, the tach four. has Jack R. by Smith 2005 - Technology -