Asalamoalaikum Hasham! Trust you're well.
I bought this Optitron Speedometer from you and only managed to work on its installation two days back. I bought another Dashboard Cluster Trim to work on the alterations as I was not going to do anything to the one already installed much like yourself. I got it connected - fit perfectly, worked like it should until I removed the key from the ignition switch to lock the car that I noticed that the warning beep would not go off and a little red warning at the bottom left of the Speedometer came on.
It was then that I realised that this Speedometer was not compatible with my GLi as, quite simply put, my GLi lacks all the upgrades that an Altis has and this speedometer is from a Corolla Sol / Auris Sol which are full option European variants.
With this in mind, I then installed this Speedometer in my Uncle's 2012 Altis to verify if this was the case and it was but he does not want his car's speedometer changed. It was a mission to convince him to let me check the speedometer in his car in the first place. Lol.
The ECU in a GLi does not support this speedometer but the one in an Altis does.
I can still install this speedometer in my GLi but it now requires a separate relay and a series of circuits connected to the ECU to bypass the functions for which the ECU sends a pulse to the speedometer and vice versa. We need to block those for the speedometer to stop beeping when the key's removed. I googled the warning light that lights up and got to know that it comes on when the ECU has failed to verify a pulse sent by the speedometer. Now ALL this would be a big risk as a tiniest of surge in the ECU due to the additional circuits and relay would conk it so I've decided not to install this anymore.
So, very very sadly and with a heavy heart, I too am now looking for an Altis Speedometer but from the 2010 variant - not the new one and sell / exchange this for that. Many know how desperate I was for one of these and now that I have it I can't use it!
A note for all who wish to install this: This Optitron Speedometer is ONLY compatible with Altis and NOT with GLi or XLi.
Hasham, I'll keep an eye out for someone who wants to sell theirs and let you know and you please let me know if someone wants to sell / exchange their 2010 Altis speedometer with this one.
Best of luck!