I dont think you have anything to worry about as I thought the gauge only displayed anything of use once full pressure had been established.
The only thing that is a bit odd is when you say it wavers between 9.8 and 10.2 bar. If this is happening once the pour/drops have commenced, then it could indicate some scale in the OPV spring - maybe one of the site sponsors/more techo people can confirm this.
Mine wavered a bit before I descaled last year, bounced more than wavered when it was at full pressure during the pour. But not in the range you stated..
If its just scale then easy fixed...another descale :)