Any way to know how much fuel in tank?

[Jand3rson]

So Matt, you were absolutely right! Swapped in the new fuel gauge and it works perfectly, as does the tacho.

[Jand3rson]

you know the needles come off, right?

anyway, if you have a 13 button OBC you can hit the 1000 and 1 buttons together and it will tell you the amount of fuel in liters.

Yes, I know the needles come off.

And reading the first post pwns you.

[accident]

you know the needles come off, right?

anyway, if you have a 13 button OBC you can hit the 1000 and 1 buttons together and it will tell you the amount of fuel in liters.

[Jand3rson]

Yeah, mine will jump up to 2k when I start the car, and unless I wind it up to (what I suspect is) about 3k, it falls down to 0, then goes back up to 2k. Then it will start working normally, and work fine until the next time I drive the car. But I have a new one on the way, so that should take care of it.

[e30Matt]

It was originally completely dead, then it would start jumping from 0 to 2000rpm when the engine reached that point and "skip" up the scale, then fall back to zero. I replaced the 6k tach with a 7k unit that was originally out of the '87 cluster I was using, and no problems now. I'm planning on doing the 885 head swap along with a bottom end rebuild in the next month or two, so I went ahead and threw the 7k unit in.

[Jand3rson]

Nope, I've actually gotten quite good at pulling/reinstalling the thing.

Matt, was your tach doing the same thing?

[Jean]

E30 clusters aren't THAT bad right? :)

[e30Matt]

It definitely helps that I went through this EXACT issue with my '88 not 6 months ago, so it's all still fresh in memory. That, and hours of dissecting the ETM wiring diagrams one by one. :)

[Jand3rson]

Dammit Matt, you are just one great big help! You get a gold star.

And I LOVE the quote in your sig. One of my favorite movies.

[e30Matt]

Sounds like the motor in the tach has eaten shit. New one should fix that.

[Jand3rson]

Awesome. Well, I'll do that when my new tach gets here, just found one to replace mine, I think the unit itself has issues. We've taken the whole cluster apart, cleaned it, put in the right coding plug, changed the SI board batteries, and it still won't read right. It just jumps up to 2k as soon as you start the car, and only moves when you run the revs way up, at which point it just falls dead to zero, and then jumps back to 2k.

[e30Matt]

So I can't swap the eta fuel gauge into the super eta cluster? Maybe I'd better just go back to the eta cluster. At least everything in it works!

What about if I went to an early ('87) 325i cluster? I know that the revs would be higher than my car goes, but the tach would still read correctly.

Yes, you can swap the eta fuel gauge into the super eta cluster. I drive a super eta myself and am currently running an '87 iS cluster with an '89 fuel gauge in it to match the sender setup my car has. Reads perfectly.

[Jand3rson]

Is the SI board in my seta cluster swappable into an eta or a 325i cluster? We JUST changed the batteries out, and I'd hate to have done all that work for nothing. Ideally, I'd really like to find another seta cluster.

[Jean]

Basically the fuel gauge needs to match the sender (or the tank or ultimetely the car/chassis/gas tank it originally came in).

Late model cars had two senders as e30matt said above, you can download the ETM for the two cars and see the difference there. That's why the gauge reads incorrectly, unless you swap it between the clusters.

[Jand3rson]

So I can't swap the eta fuel gauge into the super eta cluster? Maybe I'd better just go back to the eta cluster. At least everything in it works!

What about if I went to an early ('87) 325i cluster? I know that the revs would be higher than my car goes, but the tach would still read correctly.