Hi,
I believe this is a police pursuit vehicle, PPV. I was able to find the wiring schematics for the instrument cluster as well as the connector pinout. I attached them below.
I'm not sure what is happening but let me know if I can help. Also, here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-wiring
I hope this helps.
Take care,
Joe
See pics below. Note: Pics 1-4 were actually only two pics. I had to cut them in half to make them readable for you. I did overlap them so you can follow from one to the next.
Images (Click to make bigger)
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Sunday, January 23rd, 2022 AT 6:28 PM