I modified the back of the original facia by removing the recess material. I cut it up into tiny pieces and soaked in acetone until a plastic paste was made.
I then clamped the 3d printed cones in place (they snapped perfectly over the lip left by the original rings) then I painted the acetone/plastic mixture and in a few minutes
the new cones were permanently fixed. Look just like it did with the original cups.
The SpeedHut gauges sit in the pods and secured by their own pressure ring.
With this setup there should no issue with strength or support required from behind since the plastic panel is secure by 6 screws.
However on the Rally dash setup this could be different.
This is the view from the back with new gauges and without.
I would be interested in doing the 3d modeling for the Rally setup if someone wants to send me their gauges and plastic facia. If there is additional support required I will design that as well (I am an automotive engineer). I will get the support part made and I have a source for 3d printing but it is not where I got mine done. The total price for the first to step up and accept my office only pays shipping (both ways) and actual cost to have 3d parts prints and support bracket cut but no engineering fees.
After this, I will offer this setup for sell for anyone else interested. Any taker?
Cheers!
Mickm