AE92 Corolla Gauge cluster size and gauge choice

[FYADUP]

Hey guys.

i need to know the size of the standard gauge holes in the 240km gti and fxgt corolla dash. There seems to be 2 different sizes, one size for the tacho/speedo and then theres the rest e.g clock, fuel etc.

Also When selecting gauges, whats should I look at when comparing electric to mechanical? Whats the pros and cons. Already have electric water temp, oil temp, oil pressure, A/F ratio and mechanical boost gauge. These are autometer. Im replacing my whole dash with autometer components so am getting clock, fuel level, water pressure, in dash tacho and speedo, fuel pressure and voltmeter. For these new ones, which ones should be mechanical or electric.

Any help appreciated!