Putting this here for reference. I'm not sure what cluster I have, it's a 'bitsa' with a 260km/h cable speedo (would have been 180k originally), and [used to have] a voltmeter, but I have tried to figure out the pin outs as best I could. Anyone with a similar cluster is welcome to add information. The part number on the white casing says 83010-17350 / 157310-0053. Colours of wires are to be used at your own risk, they just happen to be what's in my 1990 Japanese GT import.
 
Edit: A5 has a wire on my Japanese turbo, so I'm guessing it goes to the boost sensor?
Edit2: added pinouts for 1993+ JDM cluster
 
JDM 1991 (with cable speedometer)
 
'A' connector (white)
 
1 - Meter ground [BR] (fuel, turbo, tacho, speed sensor)
2 - Not connected
3 - Engine fan [L]
4 - Speed sensor [V-W] (to ECUs)
5 - Boost gauge? [L-B]
6 - Meter illumination [GR] (to potentiometer which looked retro-fitted on mine I assume for Australian compliance, do they use automatic light level in Japan?)
7 - Meter illumination [G]
8 - +12v power from ignition switch [R-L] (also goes to voltmeter)
9 - Right hand turn signal [G-Y]
10 - Left hand turn signal [W-GR]
11 - Signal and high beam indicator ground [G-B]
12 - Tacho (to ignitor)
 
 
'B' connector (grey)
 
1 - Fuel gauge [Y-R] (to level sensor)
2 - Check engine [G-W]
3 - Battery low voltage [Y]
4 - Power steering [LG]
5 - Battery charge [B-Y]
6 - Fuel low [Y-L]
7 - Bulb Check [Y] (goes to delay circuit)
8 - Exhaust temp [R]
9 - ABS [R-B]
10 - High beam [R-V]
 
 
'C' connector (blue)
 
1 - Not connected
2 - Not connected
3 - Not connected
4 - Not connected
5 - Door light [R] (to door switches)
6 - Door light [R]
7 - Brake [R] (fluid and handbrake)
8 - Oil [Y-B]
9 - Not connected
10 - A/D (cruise control) [G-R]
11 - Water temp ground [W-B]
12 - Water temp sensor [Y-G]
 
Wire Colours
 
B = Black
L = Blue
R = Red
BR = Brown
LG = Light Green
V = Violet
G = Green
O = Orange
W = White
GR = Grey
P = Pink
Y = Yellow
 
 
 
JDM 1993+ (without air bag) 
 
'A' Connector (blue)
 
1 - Speedo ground
2 - Traction control
3 - Speed readout (to ECUs)
4 - Fog light
5 - Turbo pressure
6 - Meter illumination
7 - Meter illumination
8 - Speedo sensor
9 - Ignition +12v
10 - Tacho ignitor
11 - Right indicator
12 - Ground
13 - Left indicator
 
 
'B' Connector (grey)
 
1 - Fuel gauge (to level sensor)
2 - Brake (fluid and handbrake)
3 - Check engine
4 - Power steering
5 - Battery charge
6 - Fuel low
7 - Bulb Check
8 - Exhaust temp
9 - ABS
10 - High beam
 
 
'C' Connector (brown)
 
1 - Not connected
2 - Not connected
3 - Not connected
4 - Not connected
5 - Overdrive off
6 - Door light (to door switches)
7 - Door light (to interior light)
8 - Oil
9 - Engine fan
10 - Cruise control
11 - Seat belt
12 - Water temp ground
13 - Water temp sensor
 

Lots of online references if you google... Lost of different configurations of the mr2... An enthusiasts best links / downloaded PDFs are; mr2 wiring diagram pdf and mr2 bgb

Google and the above manuals have all the info / references / pictures / diagrams / how to guides for getting most basic stuff sorted... Hope that adds to helping the knowledge base / reference

I have used a lot of google-fu including your search terms and can't seem to find anything on the JDM instrument gauges. They appear to have completely different wiring. If you could point out a link I would be grateful.

Awesome information, subscribing for later reference. Does anyone know the appropriate LED globe to replace the incandescents behind the dash and the interior? I would imagine they're different because they'd require different lumen outputs.