The parts book shows two different oil pressure senders; 105.14.06.323.00 for the Jaeger and 105.48.06.323.02 for the Borletti. If the gauge pegs full scale as per Roadtrips test, I'd replace the sender with one specific to the Veglia. I'd be hard pressed to believe that 'one size fits all'.
Series 1 Euro 1750 GTV
Series 2 USA 1750 GTV