Hi,
It's a TF 135 but I did read that a small batch of cars, about 275 of which mine is one, had the indicator and wiring fitted, but not the new type tank and sensor, and the warning light was disabled. From what I read this was done by the garage / distibutor so it must have been fairly simple.
The warning light doesn't do the short self test when the ignition is first turned on and the light doesn't come on if the fluid is low in the tank, I've done all these checks.
I know, I could just fit a buzzer connected to the tank sensor, dead simple wiring, but it's not the point, I've got the new tank, wiring connected, indicator in the dash......
My only other thought was to remove the dash and check to see if there was a connector that was disconnected.
Thanks
Keith