Custom Dash Cluster

[banpei]

I would say it all depends on the gauges you are going to use...
First of all: if you are creating it from scratch, you probably are going to either use the existing header (male connector) and your current cluster, or splice out the original female connector and wire it in separate connector pairs for each gauge.
It also depends on what type of gauges you are going to use: the fuel gauge of the AE86 is basically an ammeter, so replace it with an gauge that is measuring resistance and not one that is measuring voltage. (or use the OEM one like in your photo) I believe the same applies to the oil pressure sensor: it is resistance based.
Also the speedometer of the AE86 is cable operated (also on the digital gauge clusters), so if you would use a digital item like in the picture above the easiest would be to go for a rotational sensor on the propshaft. That would mean you have to install a new wire for that as well.