I completely removed the na 33k resistor, and replaced it with a 52k resistor. That's all I did and the tach is exactly correct now.
guys, thank you. you just gave me the info i was seeking for a long time. thanks again. will try it and let you know of the results. (btw my engine swap is a JDM on USDM car, will the fix work regardless?)Ok, I have done the GE to GTE conversion, please don't be a cheapskate and use a patch wire. Buy the required resistor in case you get a spike in power!
This is my NA tacho, see the blue resistor? That is all you need!!!