Hi,
yes, there is a way how to reconfigure every gauge by your self.
You can simply doubleclick on the gauge. (You should have stopped data while recon. gauges)
After that, there will be a window for PID configuration
and there you can select appropriate PID for this gauge.
Fordiag currently does some automatic reconfiguring of gauges while ECU connections for you,
but it is far from ideal. Especially on MK4 TDCI (newer Mondeo) there is still lot of reconf. missong.
Every engine system is different and with different set of PIDs.
What still missing in Fordiag too, is possibility to save gauges configuration onto disk. So, currently,
once the software is closed, your PID configuration is lost.
I have it on todo list like one of the highest task.