In typical private sector
engineer: 2-3k
senior engineer: 3.2-5k
principal engineer: above 5k

Ass Manager: above 5k
Manager: above 6k
Dept Manager: above 8k

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Promotion prospect for above out of college average engineer

engineer Year 1- Year 3
If people does not give you senior engineer latest at the 5th year, they are telling you to go implicitly.

senior engineer Year 3 -
You can stuck here for rest of your life, but most engineer do not mind if their salary stagnant at around 5k

principal engineer/asst manager Year 8 -
With some luck, a boss who like you, and a reasonably good company, you may get principal engineer at Year 8, and stuck there for rest of your life.

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DSTA, DSO, LTA....etc
engineer above 3k
5 years get 5k if you are good at stabbing people

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Civil service pay for local non scholar graduate
above 3k
5 years get 5k if you are good at stabbing people

I look at the civil service salary forum, there are lots and lots of ******** similar to engineer salary forum. I am personally in ministry. Take 2nd lower honor teacher as example.

Join GEO 1: 3k
Year 1 after NIE GEO 1A1 : around 3.5k
Year 3-5 after NIE GEO 1A2 : above 5k

Turnover rate: horrible, within 5 years more than 50% resign despite good $$$. Being in ministry and private sector, I 1000% assured you that you find the most wicked people there in government job.
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I am seeing lots and lots of ******** in salary forum. I think PAP is trying to paint a good picture.