I have mechanical anywhere I can. Pyro's are electromechanical, so I have no choice there. Fuel level, water temp and volts - electrical. Fuel pressure and water pressure are both mechanical, liquid filled gauges. Tach and speedo are electrical.
Mechanicals are typically 270* sweep, giving better resolution than the 90* sweep electricals.
http://www.speedcraving.com/stv/stv_...s/DSCN2139.jpg