Thanks,
Also, If I replace the gauges on the flybridge & senders, how does that affect the lower helm gauges not being replaced?
It is possible that Volvo/Penta used renamed VDO gauges as they are European.
One way to check the compatibility with original sensors is to take note of the
current readings under normal conditions: temp and oil pressure while idling, say.
Hook up the new gauges before installing them and compare the new readings.
If you find the new gauges need new sensors then you have 2 problems to solve if
you don't want to replace gauges at both helms.
The oil pressure sensor can be replaced with a tee fitting to hold both old & new sensors.
The temp sensor can also be doubled with a tee but just be sure that the old sensor
still gives the same reading in the new configuration.
A temp sending unit can also be added to the coolant path using a short section of
metal tube with a boss threaded to match the sensor. This gets inserted in a hose run.