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Add Mk1-Mk3 pinout reference files
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‎PINOUT_MK1.md‎

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# Mk1 Pinout Reference
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This guide summarizes the Mk1 harness pin assignments for the Replica dashboards. It is intended as a quick-reference wiring aid; always confirm signal types and expected voltages before making permanent connections.
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## Mk1 connector mapping
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| Pin | Signal / description |
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| --- | --- |
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| 1 | Illumination and low-beam supply. |
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| 2 | MASSE 31 ground reference. |
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| 3 | TANK fuel-level sender. |
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| 4 | TEMP coolant temperature sender. |
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| 5 | KL 1 tachometer signal. |
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| 6 | UHR permanent +12 V. |
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| 7 | KL 56 high-beam signal. |
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| 8 | OIL (HIGH) 1.8 bar pressure switch. |
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| 9 | OIL (LOW) 0.3 bar pressure switch. |
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| 10 | Diesel glow indicator. |
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| 11 | CHOKE input (unused). |
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| 12 | KL 61 generator lamp. |
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| 13 | Blinker input (combined left/right). |
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| 14 | KL 15 ignition supply. |

‎PINOUT_MK2.md‎

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# Mk2 Pinout Reference
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This guide captures the dual-connector pin assignments used by Replica Gen One dashboards. Mk2 installations typically use the white and black connectors shown here. Verify connector orientation and wire colors before final assembly.
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## White connector
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| Pin | Assignment |
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| --- | --- |
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| 1 | Blinker output, tied to ground for the indicator lamp. |
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| 2 | Frei — not connected. |
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| 3 | Terminal 58, positive supply for the panel backlight. |
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| 4 | Resistive coolant temperature sensor input. |
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| 5 | Resistive fuel level sensor input. |
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| 6 | Ground return. |
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| 7 | Additional ground return. |
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| 8 | Terminal 1 engine-speed signal (coil, distributor, or other waveform up to 12 V with possible 300 V spikes). |
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| 9 | MFA mode line used to change MFA functions. |
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| 10 | UNR permanent positive supply (unused on Replica Gen One short, main supply on Replica Next short). |
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| 11 | MFA temperature “+” lead for the ambient sensor (Replica Next short). |
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| 12 | MFA oil temperature sensor lead (Replica Next short only). |
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| 13 | KL 56a high-beam indicator input (+12 V active). |
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## Black connector
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| Pin | Assignment |
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| --- | --- |
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| 1 | Terminal 15 switched +12 V from the ignition switch. |
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| 2–4 | Not connected. |
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| 5 | Handbrake indicator input (active low). |
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| 6 | KL 61 generator warning lamp drive with 120 Ω excitation resistor. |
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| 7 | Oil pressure switch, 0.3 bar. |
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| 8 | Oil pressure switch, 1.8 bar. |
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| 9 | Not used. |
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| 10 | Glow-plug indicator input (+12 V active, diesel only). |
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| 11 | Hall sensor input for optional speed sensors. |
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| 12 | MFA block selection line. |
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| 13 | MFA reset line. |

‎PINOUT_MK3.md‎

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# Mk3 Pinout Reference
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This guide summarizes the single 28-pin connector used by the Mk3 Replica Next short harness. The assignments mirror the Volkswagen Digifiz Mk3 layout, allowing direct connection to factory fuse panels or adapter blocks.
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## Mk3 28-pin harness
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| Pin | Assignment |
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| --- | --- |
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| 1 | Outside air temperature sensor -G17- ground (GND). |
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| 2 | Engine Coolant Level (ECL) sensor -G32-. |
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| 3 | Terminal 31 chassis ground. |
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| 4 | Multi-function indicator memory switch -E109- reset lead. |
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| 5 | Terminal 31 chassis ground. |
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| 6 | Multi-function indicator memory switch -E109- memory lead. |
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| 7 | Vehicle speed sensor (VSS) output. |
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| 8 | Oil-pressure switch -F1-, 1.8 bar. |
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| 9 | Oil-pressure switch -F22-, 0.3 bar. |
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| 10 | Terminal 1 / terminal W tachometer input. |
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| 11 | Terminal 30 battery supply (B+). |
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| 12 | Terminal 58b illumination feed. |
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| 13 | Terminal 15 ignition-switched B+. |
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| 14 | Not connected. |
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| 15 | Multi-function indicator mode-select switch -E86-. |
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| 16 | Generator warning lamp -K2-, terminal 61. |
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| 17 | Engine-oil temperature sensor -G8-. |
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| 18 | Brake / parking-brake warning lamp -K7-. |
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| 19 | Outside air temperature sensor -G17- signal. |
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| 20 | Malfunction indicator lamp -K83- or diesel glow-plug lamp -K29-. |
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| 21 | Fuel gauge -G1-. |
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| 22 | Left turn-signal indicator lamp -K65-. |
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| 23 | Engine coolant temperature gauge -G3-. |
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| 24 | Right turn-signal indicator lamp -K94-. |
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| 25 | High-beam indicator lamp -K1-. |
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| 26 | Fuel-consumption input signal. |
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| 27 | Vehicle speed signal from the speedometer VSS -G22-. |
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| 28 | Transmission-range (AG4) selector display. |
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### Notes
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Pins for the ambient and oil temperature thermistors, MFA buttons, and fuel consumption signal are broken out through auxiliary JST connectors bundled with the Mk3 harness. Use the breakout leads when those sensors or inputs are needed.

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