Gauges Working on DRO

I've got gauges working again on the DRO, currently two of the cheap Chinese calipers using the 24 bit data output have run on two axes of the ARM based DRO. There's a few minor PCB errors but nothing major. The switches should work soon. The only major part not working is the TFT display and that could be a code problem, or a non functional display. I've switched to an SPI TFT display, and I only had a non touchscreen version. I'm waiting for the touchscreen ones to arrive. Based on the parallel display experience, I think about 50% of these displays don't work out of the box and of the remaining 50% only half have the advertised display controller chip on them, the other half have whatever chip was hanging around when the displays were built.

Here's the ARM DRO with a channel working:

The daughter board is plugged in at the bottom left. That has a PIC 12F1822 on it that converts the data form the gauge into I2C which the main board polls in its idle loop. There's room for five more boards across the bottom of the main board.  As you can see the gauge reading is on the Z axis in this picture.

I've had two 24 bit gauges working, the third one I had wired was of the 2 x 24 bit packet format, which did work in the past but failed for some reason when I tried it. I'll make some more daughter boards and debug the problem..

The more expensive gauges I got as a trial are ironically less stable when powered off the DRO 1V5 supply so I may move to cheap Chinese gauges as they are also 0.01mm resolution and seem more tolerant to my 1V5 supply.