See my comments below in regards to dash board gauges
My first two suggestions are related to the ignition switch and the gauge cluster. I like to try a "wiggle test". Sometimes it is a great way to narrow down a search. Put the key in the ignition and turn the key to the run position (do not start the engine) and wiggle the key and turn or rock the key slightly. You want to see if maybe the ignition switch if faulty. If you notice nothing from this test then it may be fine. Next would be to remove the gauge cluster and inspect the harnesses that plug into the back side of the unit. Over time dust can work itself into connections and cause havoc on circuits or systems. I will say that from your description, it sounds like a soldered joint, loose or over-heated wire is related to this problem. At this time I can not give you a good recommendation. I can tell you that somewhere where, something has worn out. It could be related to wiring, the fuse box, ignition switch, gauge cluster, or ECU. Please write back with more questions or findings. Please be as specific and detailed as you can. I hope to hear from you soon, good luck.
on Feb 22, 2018