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honda prelude aftermarket speedo problem

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=110427
Printed Date: May 14, 2025 at 5:08 AM


Topic: honda prelude aftermarket speedo problem

Posted By: theach
Subject: honda prelude aftermarket speedo problem
Date Posted: January 07, 2009 at 10:59 AM

I have a 93 Honda Prelude and i have wired up all new gauges and the autometer speedometer i wired up through the vss wire appears to be robbing the ecu of the vss signal so that neither the speedometer or the ecu is getting a signal from the vss when the speedo is plugged in. Is there any way to boost the signal from the vss to the speedometer?



Replies:

Posted By: jeffwhiteman
Date Posted: January 14, 2009 at 11:16 PM
Can you re -write your question. The way it is worded does not make sense to me.



Posted By: theach
Date Posted: January 15, 2009 at 2:46 PM
It appears that the autometer speedometer i installed is pulling more amperage i guess than what the vehicle speed sensor can put out to the ecu and the new speedometer, i was told that gm and other manufacturers have some type of amplifier in their gauge clusters to compensate for this, how would i go about doing this, does that make any sense?



Posted By: jeffwhiteman
Date Posted: January 16, 2009 at 8:57 AM

Yes it does, thanks.

Do a google search of "op amp buffer circuits" this will familiarize you with the principal. Basically you want the input impedance to be very high, and the output impedance to be very low. These circuits are very simple to build, and the few parts you need are at radio shack. If you need help with a circuit, let me know and I will try to draw one for you. I am not very good at paint.


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