Custom E30 M3 Gauge pods are by Lo-Tek, Inc. - www.gaugepods.com
I decided to go with two SPA dual digital gauges from Andrew Taylor
- www.taylorautosport.com

The gauges I chose are oil pressure/oil temperature , fuel pressure/voltage
Below is an image of the gauges installed in the pillar and a test-fit
in the car.
The finished product:
The sensor locations and fittings