I much prefer the look of mechanical gauges with their 270 degree needle sweeps. Also I am highly suspicious of the accuracy of electrical instruments, in fact worse than suspicious.
The downside is the pain of capillary tubes and
oil pressure lines to route and make look tidy, but it can be done.
I echo DV's comments about plastic (which can melt) or copper (it work hardens and fractures if subjected to vibration). That's why my
oil pressure guage line is run in aeroquip -3 stainless braided and pvc coated line.
With the exception of the warning about the
oil pressure line, I guess it's all down to personal choice.