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You will need to get all faults read out of each control module ( engine, transmission, ABS, Airbag, Instrument cluster)
And before going any further make sure there is oil in the engine and brake fluid in the resivior.
The control module for the instrument cluster is the instrument cluster.
Were you able to check faults in the cluster?
Coolant migration could get into the instrument cluster harness.
The ABS control module could be faulty but all of your lights flashing and cluster going crazy all seem related.
Get a Vag-Com and scan the instrument cluster for faults.
You can also check one of the main harness grounds that are located under the batter tray. make sure the nut hasnt loosened up a bit.
If you want i can run the vehicles VIN for any possible recalls, but none that are pretaining to your issue
Well honestly either your cluster is faulty or you have an ABS issue an Oil pressure issue and a tach issue, but you will have to elminate something.
To communicate with the ECM and the rest of the modules i would suggest removing the radio and clipping the K wire to allow communication to the modules. it should be a black wire with a grey stripe, if you provide me with the VIN i can make sure this is the correct wire for your car.
Ok. Sorry for the lack in response. Ive been having Internet issue's.
The ECM faults appear to be either a broken wire from the cluster to the ECM or the cluster is bad. Also, your MAF sensor looks faulty.
The Transmission control module doesnt look like it has any coding. Any recent transmission or TCM work done? Do you have access to a scan tool to talk to these control modules or did you just go to the dealer to get the faults read out?
Hmm, well i think you can only input the mileage in a cluster once. However im uncertain if the VIN number is XXXXX into the cluster or if it just read out via the ECM (when they are communicating with each other). Ive never attempted to install a used cluster so im not sure what hoops you have to jump through to get it to work.
Im not sure what they mean by it cant be programmed, it may not read the correct mileage but the rest of the inputs should be able to be installed.
Where are you located?
Ok, well thats the only other thing you can check (wiring). I will provide you with the desired diagrams.
Looks like there is a connector in between the cluster and ECM under the plastic cowl under the windshield.
Well now that you have the wiring you need im going to ask you a few questions.
With the Oil light on and flashing, have you verfied there is the correct amount of oil in the engine and that the oil pressure is ok?
With the ABS light on and the brake light flashing, when the dealer read out the faults what were the faults stored in the ABS module?
The no tachometer issue, you can verify the gear in the transmission is not busted by removing the sensor from the transmission and spun with an electric drill with the key on and the tach should respond.
If all these bases are covered id say your cluster is your main concern, and with possibly all the wiring checking out, i would say this is your issue, replacing the cluster with a brand new one would be the only route i would take.
If you have anymore questions feel free to ask.
Hmm i would say the instrument cluster is bad if all the wiring checks out.
Dont feel bad, early a4 chasis jetta's,golf's, beetle with electrical issue's have kicked even seasoned VW tech's ass.
Well the fact that you can communicate to the ABS module is a good sign, normally when the lights of death come on (ABS light on and brake light flashing) normally means the ABS module has kicked the bucket. If you can clear the ABS fault and see if it is stays erased would be a good reason to suspect the cluster.
Are they very thin wires?
If im thinking the same thing you are, than no. Those would be can-bus wires.