A practical engineering reference for a rare cluster variant

Overview

UPDATE: Later the official schematic was found

This article documents the electrical pinout and internal behavior of a rare Volkswagen Mk1 Rabbit instrument cluster for which official documentation is difficult to obtain.

The cluster uses a dual-row 18-pin connector (9+9 layout), with numbering defined from the rear side.

The main PCB is flexible (and very old) and now most of them are in very bad condition.

Connector Layout

Rear view numbering: 
1  ...  9
10 ... 18

Pinout Description

Upper Row (Pins 1–9)

Lower Row (Pins 10–18)

Internal Design Characteristics

Analog Measurement System

All primary gauges (fuel, temperature) are based on:

• Bimetallic thermal elements
• Heating via controlled current
• Mechanical deflection proportional to temperature

This design is consistent with early Volkswagen clusters (Mk1, Mk2).

Stabilized Supply

• Gauge elements are powered from a regulated ~10V supply
• Ensures stable readings independent of battery voltage fluctuations

Indicator Logic

• Most warning lamps operate on active-low signals
  → The cluster expects a ground signal to illuminate
• Exceptions:
  • High beam (Pin 18) uses positive drive
  • Illumination (Pin 6) tied to vehicle lighting circuit

Notable Electrical Observations

• No diode present in series with the alternator lamp (Pin 17)
  → Important for proper excitation circuit behavior
• No digital electronics present (except clock but clock does not work on my unit)
  • No signal conditioning ICs
  • Tachometer input likely handled via discrete analog circuitry, but our cluster is without tacho.
• Minimal signal processing
  → Direct wiring + passive components dominate design

Engineering Notes

• The cluster is fully analog, making it:
  • Easy to interface with custom hardware (e.g., microcontrollers)
  • Predictable in behavior
  • Robust but less precise than modern systems
• When interfacing:
  • Respect active-low logic for most indicators
  • Provide stable voltage for gauge emulation
  • Use appropriate signal shaping for tachometer input

Conclusion

This instrument cluster represents a classic analog automotive design, with simple yet effective circuitry. Despite the lack of official documentation, the pinout and behavior can be reliably characterized, enabling restoration, testing, or integration into custom automotive or embedded projects.

There is a lot of unclear information about Golf/Jetta 2 pinouts so we decided to publish the information for these old cars here free of charge and so everyone can use it in projects and in repairs.

Golf 2(Jetta 2) had two generation of cars, the first was CE1 and had two sockets in the car – black and white, and the second one, CE2 – white or black single two-row 28-pin(14+14) socket with 2.54 spacing.

CE1

Below is a pinout of CE1 version of wiring with two versions of the naming.

Plugs are assembled from two parts but it’s not easy to notice it.

The plugs part number:

White:

AMP 926505+927294

Black:

AMP 926505+927293

The plugs are slightly different in their appearance.

Important – the crimped pin part number:

000979115E

It is almost impossible to buy it separately and uncrimped, unfortunately.

White connector

Black connector

CE2

Reference: Internal tests and checks And (many thanks):

https://www.a2resource.com/electrical/CE2cluster.html

Example connector was provided in one of the clusters, which was sourced from a car junkyard. Connector(car side) part number: 191 972 530B Additional label: “W. Germany. 6HW 16 331”

28 pin is organised by 2 rows by 14 pins. Pitch: 2.54 mm. Distance between rows: 2.54*2 mm