Speedo question

[Rittmeister]

OK guys, I've got a problem. 1990 Ka24E.

I have the infamous non-functioning HUD problem, HOWEVER I also had NO lights in the dash cluster. The lights in the radio/HVAC controls worked, but the only thing working in the gauge cluster was the tach. The odometer didn't work either.

Fast forward to today. I got a spare cluster and HUD from another S13. I put it in before realizing that it was from a DOHC car, so the tach doesn't work. My own fault, however the HUD and speedo on the new cluster also aren't working. My question is this: are the speedometers also different between SOHC and DOHC cars? Or is there a speed sensor or something that is either bad or is different between the engines? The backlighting is working now, so that's OK. Don't know if the new odo works, I don't want to drive it until it's put back together.

To sum up: neither HUD nor speedo are working. Everything else is, except for the tach, which I know how to deal with.

I really need help. My dash is all over the passenger floor right now until I get this resolved.

[Rittmeister]

OK seriously, what do I have to do to get someone to look at this post? My car is in pieces, I have a simple question that searching has not answered, and I need help. Basic question: is there a difference between SOHC and DOHC speedometers, OR will the speedometer simply not light up if the speed sensor is bad?

TIA

[nrcooled]

You need the speed sensor for the DOHC.

[Rittmeister]

So you're telling me the speed sensors are different? If the sensor was bad, would the speedo just read zero, and since it's the wrong sensor it's blank?

[Rittmeister]

Does anyone have any more info for me, suggestions or opinions, before I start buying parts at random to see what happens?

[nrcooled]

Do you have any friends with 240s. Grab a DOHC speed sensor and do a swap to see if it works.

I understand your position considering that electrical items can't be returned but I am almost positive that the SOHC speed sensor will not work with a DOHC cluster.

Edit: After reading your post again what about the HUD wasn't working? Just the HUD or the speedo on the cluster also? The tach on the DOHC cluster won't read a SOHC signal and the speed sensor won't show without the DOHC speed sensor.

My suggestion: Get a FSM and a voltometer and get to work!

sorry I can't be more help but that is exactly what I would do in your positon