From actual measurements on my 1989 Mustang LX 5.0 gauge panel or instrument cluster. My Ford connectors are indexed from the small key and numbered. I used the numbers on the OEM connectors.
Right front gauges, or left rear connector:
| Pin | Open voltage | Short current | 100 ohms | 10 ohms | Descrip | ||
| 1-7 | no female traces | ||||||
| 8 | from op-amp output | have not traced | |||||
| 9 | ~7 volts | Oil Pressure | pulls to ground | ||||
| 10 | Fuel Level | See data, pulls to ground | |||||
| 11 | + 12 volt switched | power dash left side, fuel oil etc | |||||
| 12 | Ground | ||||||
| 13 | belts indicator | apply voltage for light | |||||
| 14 | dash lamps | apply adjustable 12V |
Fuel
| Voltage | Current mA | Scale |
| Short 0 | below empty | |
| 2.5 | Empty mark | |
| 3.2 | 1/8 | |
| 4.4 | 1/4 | |
| 5.5 | 55 | 1/2 |
| 6 | 3/4 | |
| 7 | Full mark | |
| open | 0 | Pin Full |
Left front gauges, or right rear connector
Final Dash
Final dash has warning lights instead of instrument cluster. Still has turn signal and bright light indicator.
Voltage meter at 12.5 and lower shows red, indicating battery discharge, the tach shift light is two super-bright red LED's :
