The real cause of injector rattle?

[JTaylor2005]

So what does the gauge go up to then before the red zone? 70 has a line. Then 80c. 90c is at the top line and then two more before the line before the red zone. 100, 110, 120 final line? Or does it not make sense like that?

---

So far the highest it has gone on the gauge is 95ish c. That was after crawling up a hill side tiny road at 3000rpm in 2nd haha. Normal running it sits just under 90 on the gauge.