Ryan Simmons Posted August 4, 2011 Report Share Posted August 4, 2011 I have upgraded the single coil / distributor system on my 3s-gte engine to a set of 4 1zz-fe Coil on plugs. The engine runs on them and the PClink software will show the engine RPM no problem, however the dash Rev-counter does nothing! I guess the old RPM signal came from the single igniter. What would i need to do to get the Rev counter functioning again? Many thanks Ryan Quote Link to comment Share on other sites More sharing options...
Jurgen Biggelaar Posted August 12, 2011 Report Share Posted August 12, 2011 Hi Ryan. The best thing you could 'try' is setting a spare AUX as a tacho, as this would work if the dash only needed a low level input. If this does not work, it's likely you have a tahco needing a high level signal in. This leaves you needing to have it modified (if it can be), or installing another that fits the vehicle. Jurgen Quote Link to comment Share on other sites More sharing options...
Ryan Simmons Posted August 15, 2011 Author Report Share Posted August 15, 2011 Yes my tuner suggested that method too, i believe the tach wire from the stock igniter is +5v -i assume this is 'Low' level? 12v being high? Quote Link to comment Share on other sites More sharing options...
Simon Posted August 15, 2011 Report Share Posted August 15, 2011 That would be low level and should be able to be driven from the ECU on an AUX out. A high level signal is off the coil negative and can be in excess of 40V Quote Link to comment Share on other sites More sharing options...
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