That looks amazing! Thanks for sharing the details and the great pictorial with us. The sheer "wow" factor and the reliability improvements were totally worthwhile. Consider it a sound investment from your research and development budget.
Getting rid of all of those incandescent light bulbs has the great benefit of freeing up additional Amperes of current which will help charge your battery faster. It might have cost quite a bit in initial outlay, but your battery and wallet will both thank you going forward!
If you care to pursue it, if the back lights power is separate from the gauges and sending units, you may be able to install an inexpensive generic PWM DC motor speed controller from Amazon or eBay to allow normal dimming of your LED back lights. It would be no more complex to install than the solid state regulator you had retrofitted.