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    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

    cheers
    Happy new Years!

    #2
    Problem solved, traced wire all the way past the fuse box, down the dash area, all the way till i hit the mother load of wire harness on the left side of the driver seat under the carpet, all wires are corroded, rewired everything back to stock, and now everything is back up EVERYTHING!


    Originally posted by Liquidc3lls View Post
    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

    cheers
    Happy new Years!

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