The connection for the position sensor and the tachometer are on the aft intake brace and the tachmoter is the one with no tie wrap.
The sensor is on the flywheel.
See the two connector just beside the idle speed actuator in fig #3.
I have used WD40 to clean and treat the connector.
http://members.roadfly.com/kcroncarter/etm214.htm
Here is the system diagram.
http://members.roadfly.com/kcroncarter/etm125.htm
Later,