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Message: <blockquote data-quote="1FastGT" data-source="post: 323423" data-attributes="member: 9656">So i had purchased a shift light from this company their hand made. the guy i guess owns a Camaro, and has designed them to fit snugly(grammer) into the little circular vent on the driver side pillar. <img src="http://www.harlan-engineering.com/store/shiftlight/pics/gauges2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />the shift light only has a power ground and signal wire. (3 wires)  it says in the directions to "Green Wire Ã¢â‚¬â€œ This is the Tach input to the module. This can be either from the Tach line of the enginecomputer or from the switched side of an ignition coil."i had attached it to the wire going to my ignition coil (1994 mustang GT) and i set the shift light for 5800 RPMS and the light comes on when you hit 3000 RPMS with more then 3/4 throttle. so i figured not a good spot. and i tried to find the Tach wire from the ECU. (OBD1)the signal just seems to erratic and inconstant from where i had it setup at.where is the Tach wire on the ecu harness located a picture would be wonderful!!!someone PLEASE HELP. links:<a href="http://www.harlan-engineering.com/store/store.html" target="_blank">http://www.harlan-engineering.com/store/store.html</a><a href="http://www.harlan-engineering.com/store/shiftlight/Instructions.pdf" target="_blank"></a><a href="http://www.harlan-engineering.com/store/shiftlight/Instructions.pdf" target="_blank">http://www.harlan-engineering.com/store/shiftlight/Instructions.pdf</a></blockquote>