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Old 09-11-2010, 08:30 PM
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Electrical Speedo

I have a 1988 K5 blazer that someone at sometime swaped a 1979 np203 transfer case into and then switched over to the old cable style speedo. Well that whole system is broken, the cable broke and the speedo is junk. I want to put an electrical speedo that can be calibrated for diffrent gear ratios and tire sizes but I don't even know where to start.

Does anything like this even exist? Can I even use an electronic speedo in this truck? Where would the sensor go? Any info would be great.

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Old 09-11-2010, 08:34 PM
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Buy yourself a GPS....has a speedo built in and you can find your way home too.......
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Old 09-11-2010, 08:58 PM
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thats what I use right now but I want a working speedometer.

So I found this:
http://www.amazon.com/Auto-Meter-248.../dp/B00062Z6Q0
Instructions:
http://www.autometer.com/download_instruction/840e.pdf

This is exactly what I need, its self calibrating and everything this is that sensor that I would need says it screws into the 7/8" speedometer cable output in the transmission. I'm not sure but I thing the speedometer cable output is the same size in the np203. Can I just screw this into the side of the t case, have it self calibrate and thats it? does it matter what plastic gear is in there?
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Old 09-11-2010, 09:09 PM
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alright so heres the sensor I need:
http://www.summitracing.com/parts/ATM-5291/

This just screws onto the speedometer cable output, the instructions say that you put it on the transmission but the output is exactly the same on my transfer case so it looks like I can just put it there. The instructions say that you only have to take the nylon gear out for on ford but I think I may have to take mine out. Has anyone ever used one of these on a transfer case?
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Old 09-11-2010, 09:15 PM
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Install the sender where the old speedo cable was connected.
Wire it as directed in instructions.
Calibrate as directed.
Done.

vicrod
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Old 09-11-2010, 09:33 PM
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Now that I think about it your 100% right. There is no diffrence at all between my th400 cable output and my np203 output. Awesome this is way easier than I figured it would be. Thanks for all the help.
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