Hi
The wiring code on those senders is sometimes confused, "G" is for the gauge and "W" is for the warning lamp.
I asked on a WRX forum what sort of pressures do they get at startup, I was told that when cold they peg 10 bar (145 psi) so it sounds like you have the correct gauge.
Can you get a VDO agent to check it out for you?
I've used VDO gauges for years and I've never had a problem.
Steve
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