E30 Tach mystery
Hey guys, new to this forum read all the rules, did the search read every article i can find of help, and in conclusion i cant find an explanation to this mystery...allow me to elaborate,
I got my 1990 325i, a good 4 months ago, when i bought it, i had no speedo no tach and no mpg and of course the mileage does not work either except for the Temp (twitchy) and gas (fine), which i understand is quite normal for these cars, i know that i needed to check the grounds, maybe its that or the SI board or the Batteries. what i was planning on doing is finding out if its a "GROUNDING" issue first, or Batteries or the SI board....that was the plan.....today heading off to work, i turned the car on waited for it to warm up while i was prepping my coffee, its -28 in ottawa
.......once i got back in the car about to head off i noticed my Tach was working (twitchy) and my MPG is working(fine) but no speedo. I don't understand this because i have not done anything to make it work except unplug and re-plug the diff sensor 2 weeks prior, and it didn't work then...it just started to work out of no where, am genuinely very confused and with this new curve ball i don't know what and where to start from!
any help to clear this mystery would be appreciated just so that i understand what to do next in the hopes of fixing that speedo!
i do have an after market stereo from PO....i heard those can usually affect the cluster.
Thank you guys in advance
Happy new Years!