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04-13-2016 04:27 - edited 04-13-2016 04:28
The 2000 wiring harness and tach are compatible with your new E-TEC. Did you install a new harness or re-use the old one? Either the tach failed or there is a connection problem causing an open circuit.
It sounds like you rigged the motor yourself. Did the dealer at least check it over and fill out the required pre-delivery checklist that you both have to sign before the engine is registered with the factory for warranty coverage?
For your information, here is a link to an installation and pre-delivery guide that you may like to have for reference.
The generated tachometer signal is the gray wire that comes out of the EMM and goes to the 8-pin connector at the tach. Your tech can check the continuity of the wire and if there is the proper frequency signal coming from the EMM using the Evinrude diagnsotic software.
The quickest test for the tach is to plug the 8-pin connector into a known good tach and monitor the results.
If you get a non-SystemCheck tach like your current one, make sure it is set for 6 pole alternator on the back, not 5 pole.
Obtaining a SystemCheck tach, it has the 4 warning lites in it, would be your best choice and you would have a free'd up hole for another gauge.
04-15-2016 01:28 - edited 04-15-2016 01:32
A SystemCheck tach, which has the 4 warning lights built in, only needs the 8-pin connector (from your 2" gauge) plugged into it to work. Tape off the 3 wires that you have on the current tach as they will not be used anymore.
Your dealer would be the best choice to have check your motor out to find the problem, It has to be determined if there is a fuel, electrical, or a mechanical system at fault and what is needed to correct the situation.