South-East asia speedometer 220kmh conversion to JDM Demio Sport 180kmh

[haywood15]

Hello everyone, long time enough not posting in forum lol

recently, I've been converted the stock 220kmh speedometer to the JDM Mazda Demio 180kmh. Basically why I'm doing this because the JDM speedometer looks much better rather than the Southeast Asian version.
to install this, I've been hacking my immobilizer in order to get my car on. But there's another problem occur, that the speedometer didn't read what its supposed to read like when the actual speed was 100kmh the speedometer is only read 80kmh.

my question is, is there any way to calibrate and fixed my speedometer? thanks

 

[cosh68]

haywood15......

Have you checked what data the ECU is sending to the module in the clocks via the CAN Bus, use an OBDII device to monitor the PID 0D vehicle speed ?

Shaun.....