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IMO shift lights are useless anyway..... when you're driving hard enough to damage the engine the last place you are/should be looking is the dash!!
That and if you need a light to tell you when to change gear you really should practice a bit more! 
The rev limiter is set at a speed that will not damage your engine.
You can go to the rev limiter in every gear and it will not harm the engine, unless it's cold.
In fact, revving higher more often is better than tootling around at 2-4000rpm all the time as that cokes the inlet valves up and causes sticky valve sindrome (that is when the cam lobe moves away from the follower to let the valve spring shut the valve, but the valve sticks open loosing compression.)
Early Zetec engines suffered with this, that is why it is very important to use Ford oil as it has a cleaner/lubricant in it to keep the valves lubricated.
When you rev an engine over 5,500rpm the valves don't just open and close, they also rotate in their seats/stems due to the speed/force of the air coming past them. This acts as an automatic de-coke to keep them clean.
The rev limiter/shift light actually kicks in at about 250rpm before the rev limiter kicks in.
The light is on the rev counter, which is for reading engine speed so is the first place you should look I think
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2011 Focus 3-door Zetec 1.6 TDCi.
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