Dead Speedometer and Odometer

[240sxhelp]

Just pick up a 89 240SX, runs pretty good except for no speed readout on the HUD and the odometer doesn't move and the gas gauge only registers 1/2 tank when Full. I heard that the HUD's are a problem child. The car came from a used car lot so I have no history on it. Previous owner has added two different switches under the dash, one button starts the engine with the key in the ignition. Haven't been able to figure out what the other button does...it seems that it doesn't do anything.I'm thinking that the previous owner fried the HUD when he made the previous mentioned buttons or when he riped out his indash radio equipment (just have a big empty hole). Any suggestions?I tracked down a used whole instrument cluster, think that all three problems are somehow connected. Any help will be helpfull.

[Stoneage_Turbo]

isnt there some kind of "meter regulator" in there , was on my 87 sentra , made some headaches , id check some fuses too , tho im sure ya done that already

[king240]

I have a 92 coupe with HUD, the speedo and odometer both quit suddenly, but the criuse control still worked. so the computer knew how fast the car was going, so the hud unit went south,not the speed sensor, bought a new one, $250 canadian, installed it, works perfectly!

[QuinGarcia]

whta is HUD? Heads up display? wjat the hell is that? Tell me its not the same stuff as on the new Corvette's

[Mayhem_J30]

whta is HUD? Heads up display? wjat the hell is that? Tell me its not the same stuff as on the new Corvette's

Quin, you're diggin way back aren't ya? Look at the time stamps.

[240_Keyy]

well he may have dug it up, but it is a good question. Everyone keeps saying that this is covered in the FAQ, but I can't find it. I am a moron I guess...

[br2819]

i have an HUD cluster off a 93 that works. i will sell it if you are interested.

[jmancini]

Guys, here's the deal:

The digital speedo is a separate electronic unit in the cluster. It drives the digital display, HUD projector, and the odometer. Seems to have some design flaw that causes it to crap out for many people. Frequenty it is also affected by temperature - that is, when its cold it won't work, but as it warms up due to use, it starts working! I pulled my digital cluster and troubleshooted (troubleshot?!) it trying to figure out which component was causing this. I was not successful. Maybe some PhD genius could solve it, but without detailed wiring diagrams....

Anyway, if your's has died or is dying, replacement with new seems to be the best (only?) solution. Don't replace the whole cluster, all you need is the speedometer controller. Its very easy to remove this component from the cluster. I understand its about $200 or $250 from better Nissan dealers. I switched to analog. (PS - if you switch, you'll need the cluster wiring sub-harness as the plugs on the back of the cluster are different between analog/digital).