how to get stock tachometer working

[notwater]

how to get stock tachometer working on swapped ae86, hoping it’s possible since it can be done on Ms2 and Haltech

[Adamw]

Assuming you no longer have the stock coil ignitor, then your high voltage tacho wont work with any aftermarket ecu directly.  The same methods for making it work with MS or Haltech will work with Link.  You can either modify the tacho so it operates with a 12V signal, or you can fit a "tacho booster" between the ecu and tacho to generate the high voltage spike required to drive it.