Ok i don't know if this is the right place to post this question but i dunno where else to put it.

So im Starting to make My rx7 it is a 2nd gen white s5 lights and so on anyways, i woke up today with an amazing idea that i want to do!!!!

So i want to mount a Digital Rpm Gauge With Preferably A fill up bar type, Kinda like the rpm gauge on Kit in night Ryder. And a matching Digital Speedo Gauge Both easy read from say 5 feet away on to the back of my drivers side headlight so that i can see them while drifting without taking my eyes off my line. Plus lets admit it that would be bad *** looking at a street light too.

But i cannot find big enuff gauges anywhere or any help in how to find a thin enuff one to put there or how to keep them safe from water. Can anyone help me with this idea?