Rennkompressor problem

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Does anyone out there have one with the new EVA valve head fitted? If so, have you had any problems with inflating Schrader-valved tubes? I've not had to do many as I rarely have to attend to the kids bikes, but I've tried twice recently and both times the pressure indicated on the gauge just winds 'round to about 120 psi then stays there with the needle rising and falling with each pump stroke and me having no idea whether I'm getting any air in or not. When I attach the head I just puch it on as far as possible then operate the lock lever to keep it there.
The only instructions were on the box it came in which were diagramatic and I'm doing what it showed me to do.
Help!
 
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