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Tachometer Issues

 
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Old 09-30-2013, 12:35 PM
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Tachometer Issues

So I have a 94 prelude and my speedo was off a bit and plus the guage had 314k so my friend gave me a new one. I put it in and noticed the tach needle was all the way over on the other side so I thought I broke it. I took it out and kinda leaned it over to the other side, put it back in and the tach needle doesnt move until I rev it a lot and then still it barely moves, Let me know guys :D

Was thinkin about takin it apart but I want to ask if there was anything I could do.
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Old 09-30-2013, 05:51 PM
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Re: Tachometer Issues

We have completely analog gauges (compared to modern cars which have the needles under control of the computer). If you pull your cluster there are calibration screws covered by blue tape on the back and side - A pair for the tach and another for the speedo. There is no established procedure for using them as far as I know. I had only moderate success trying to use them to fix my speedo and haven't even started to mess with my tach as I didn't know it was wrong until recently. (Turns out 80mph @ 4500 RPM isn't normal).

When I have time, which probably won't be until after I graduate college in December and find a job, I intend to calibrate both gauges by putting the car on jack stands and running it in gear with the cruise control on to hold the RPM steady, and using a timing light with a digital tach to read engine speed so I can calibrate the gauge in the dash. Then I can use the gear ratios and tire circumference to calculate the actual speed and calibrate the speedo based on that.

It goes without saying that this is rather dangerous, so do it at your own risk. Also, it may be necessary to pull the ABS fuse so the ABS computer doesn't freak out over the rear wheels not spinning, throw a code, and go into fail-safe mode. If you try this, let me know how it goes.
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Old 09-30-2013, 07:47 PM
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Re: Tachometer Issues

Hmm seems too time consuming for my schedule but I was thinking , if half works on each cluster is there a way to combine both working parts into 1 cluster lol? if not ill just get a new one, thank you KingGeorgexiii
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