How to activate the tachometer when the 4A-G coil on plug

[azmak]

I changed the AE86 4A-G 16V to coil on plug.
After that the tachometer does not work.
How can I get it to work?

[Adamw]

You most likely have a high level tacho.  You can either use a "tacho booster" to make it work, or you can remove the tacho from the car and modify it.  If you search some of the Toyota forums you will probably find instructions how o do it.  Usually it just involves changing a few resistors.  

Here is a low cost tacho booster: https://www.ebay.com/itm/142171581596

[azmak]

Thank you！