Thank you for the details and the pictures, I will need to do some more digging regarding Bosch bottom pivot gauges.
I forgot I ordered these on Amazon in the end, we have very little selection up here in person; these are the part numbers I used:
Bosch SP0F000041 Style Line 2" Electrical Oil Pressure Gauge
Bosch SP0F000049 Style Line 2" Electrical Water/Oil Temperature Gauge
Bosch SP0F000043 Style Line 2" Electrical Voltmeter Gauge
.. and to prove how great my memory is, the fuel gauge movement is actually an AutoMeter:
Auto Meter 1318 Arctic White 2-1/16" Short Sweep Electric Fuel Level Gauge