ROMEO:

PIN 0 - SER TX
PIN 1 - SER RX
PIN 2 - clutch switch pickup
PIN ~3* - CLUSTER TACH
PIN 4 - CENTRAL TEMP GAUGE
PIN ~+5* - (SPEEDO SEND?)
PIN ~+6* - 
PIN 7 - CLUSTER TEMP GAUGE 
PIN 8 - 
PIN ~9* - ( current fuel rate? )
PIN ~10* - ( current fuel rate?)
PIN ~11* - current fuel rate?
PIN 12 -
PIN 13 -
AIN A0 - o/b indicator
AIN A1 - gear indicator
AIN A2 - mil indicator
AIN A3 - oil press indicator
AIN A4 - acc check ind
AIN A5 - 

UNO:

PIN 0 - SER TX
PIN 1 - SER RX (clutch switch, gear, etc)
PIN 2 - BC SWITCH PICKUP
PIN ~3* - OBC CHIME PICKUP
PIN 4 - SWGEAR IND
PIN ~+5* - SWGEAR IND
PIN ~+6* - SWGEAR IND
PIN 7 - AMBIENT DHT11 TEMP SENSOR
PIN 8 - CAN SHIELD
PIN ~9* - CAN SHIELD
PIN ~10* - CAN SHIELD
PIN ~11* - SHIFT IND CLOCK (HC595 11)
PIN 12 - SHIFT IND LATCH (HC595 12)
PIN 13 - SHIFT IND DATA (HC595 14)
AIN A0 - upper switchgear
AIN A1 - lower switchgear
AIN A2 - insp reset relay
AIN A3 - OBC COMPUTER BC OUT
AIN A4 - LCD
AIN A5 - LCD