Kclank Posted November 13, 2014 Share Posted November 13, 2014 Ross at SDS told me that some of the later 74 & up tach "might" work with SDS EMS. Anyone done this? I am trying to keep a stock appearing dash but if a later year Datsun tach can work I am ok with that. Any input? Quote Link to comment Share on other sites More sharing options...
softopz Posted March 1, 2017 Share Posted March 1, 2017 You have 3 options use the later tach. There is a mini circuit board option if you google you will find it . from classiczcars beermanpeteThe 4 wire tach 240Z tach uses a current sensing circuit on the positive side of the coil. With the original points type distributor the +12V (black wire) connected to the ballast resistor. The green/white wire runs from the other side of the ballast resistor to the tach. The black/white wire returns from the tach to the positive side of the coil. To get the tach to work you need to connect the solid black wire to the green/white wire (remove the black wire from the coil) and connect the black.white wire to the coil. I wish I knew this before I went with aftermarket gauges. From what I understand and seen here on HBZ guys with MS2 and EDIS which essentially the same type of coil pack. You bypass the ballast resistor run the tach from the 3 terminals of coil pack with diodes I believe straight to tach. Quote Link to comment Share on other sites More sharing options...
softopz Posted March 1, 2017 Share Posted March 1, 2017 https://wiki.autosportlabs.com/TachAdapter $10 seems like a good solution and you dont even have to pull out your tach. Quote Link to comment Share on other sites More sharing options...
240zip Posted December 11, 2017 Share Posted December 11, 2017 Has anyone used the above Tach Adapter with SDS? I have the EM5-6F (from SDS) for 240Z turbo swap. Quote Link to comment Share on other sites More sharing options...
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