Oh it makes sense now, I thought you meant by your left knee as you were taking the photo (silly I know)
the two round connectors are the signal to / from the distributor (what the tacho counts) my minis had these there already try to find them and they simply plug in. One side should come from the ignition the other presumably goes to the distributor they are white wires (might be a trace but mostly white) they are connected together by two black connectors you'll know the ones because if you disconnect they and try to start the car it won't go (no signal to / from the distributor)
On mine where there is the screw (next to the other electrical connections it is connected to printed circuit in your photo) I connected this up as an earth (mine didn't have one for some reason) if you take the plastic cover off it is the only place the tacho can earth. The other connection is power I used the switched power from the ignition cause I didn't want power going in there all the time in case it might frazzle something.
That should do it the lights I just put in a couple of bits of wire to grab power from the rest of my dash but it looks like you have a printed circuit thing that is meant for a three pod dash.
Your old tacho (the big one) may use a different system so I think I would ignore that for a bit.
Let me know if I can help...
Sorry I am not near that mini at the moment so I can't get a photo.
