As most people on here are probably aware, the MotoMeter MFA Gauges fitted to many MK2's are quite unreliable and so far the only true fix seems to be "swap for VDO". Hopefully, this thread might change that. DISCLAIMER: VERY electronics heavy, be warned The issue with my set of gauges, and most people its seems, is the rev counter, MFA, and certain warning lights don't work however the clock does work. No amount of playing about with fuses, removing the battery to reset the gauges or swapping the 10 volt regulator can solve it, meaning it is deeper within the gauges. The first step I've taken was ruling out the blue flexible PCB. This was done using a continuity tester to determine what pins on the CE2 connector correlate to which pins where the flex PCB connects to the gauges. Once this was done, I removed the flex PCB, took the gauges apart, and powered up just the rev counter section using a 12 volt supply connected to the pins found earlier: As you can see, it worked! Actually this was bad news as it means the fault is on the main PCB... So now the gauges are apart we can see the circuit board with all it chips, I've identified the key ones of the picture below: The NEC processor is what controls the gauge's. Its a fully integrated chip with in built-in RAM and ROM, LCD driver, AD converter and serial interface (Datasheet). As the clock is working, it suggests that the chip is working to some capacity as it's actually keeping accurate time and driving the LCD with it. This also means that chips power supply must be okay, which can be confirmed by measuring 5 volts at the regulator and at the test points marked in yellow. As the main power supply seems to be okay, the next step was checking that the chip is actually receiving the "run" single when the ignition is switched on, as if this was not present it would explain the symptoms. After tracing the tracks from the main connector I found the test point shown in yellow below: There is around 4.8 volts present at this point when the switched live wire is connected to 12 volts, and 0 volts present when not connected. Tracing further, the 4.8 volts eventually connects to pin P41 on the MPU. This 4.8 volts is within the HIGH logic threshold of the chip, meaning that is probably isn't the issue either. At this point, I'm at a bit of a loss. There is a relay, show in red on the first image, that doesn't seem to do anything, I'm going to try and trace it out but the tracks are very dense in that area so its a challenge. If anyone has any idea what it does feel free to let me know! My next step is going to be attempting to read the EEPROM, as this will contain all the configuration data for the gauges. Looking at the datasheet, this chip is only rated to retain data for 10 years!! This chip was programmed 30 years ago... So there is a very good chance that the configuration has simply been lost to time, and I'm assuming that if the MPU doesn't get any data it just doesn't enter its "run" mode and stays being a clock. If this turns out to be the case, I'll have to try and source the original configuration data, either from Bosch (owned MotoMeter at the time) or from a working set of clocks.