mechanical speedo(np207) to electronic(np231), How?? - JeepForum.com
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Unread 09-04-2009, 02:25 PM   #1
wakingside
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1988 YJ Wrangler 
 
Join Date: Jul 2009
Location: wi
Posts: 13
mechanical speedo(np207) to electronic(np231), How??

For some reason my 88' yj had a 207 in it, and now that I swapped to an AX15 I had to throw in a 231. The 207 had a mechanical speedometer in it and the 231 has an electric.

I'm just wondering what it will take to get the speedometer working

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Unread 09-04-2009, 02:50 PM   #2
93jeepyj
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1993 YJ Wrangler 
 
Join Date: May 2008
Location: windsor locks, CT
Posts: 2,686
You should be able to pull the electronic sending unit out of the np231 and use the old sending unit from the 207. If not mechanical sending units for the 231 are very easy to come by so you can just use your cable and speedo already in your jeep.
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Unread 09-04-2009, 03:54 PM   #3
Alfons
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1992 YJ Wrangler 
 
Join Date: Jul 2005
Location: Ontario, Canada
Posts: 2,218
A lot of the transfer cases have similar speedo gear inserts. The D-300 & YJ NP231 (long shaft) are the same and come in two pieces - the upper part should come off and the VSS (vehicle speed sensor) or the cable drive section should fit on the same gear retainer. The gear retainer (with gear) is the second piece.

If the NP231 that you have is the long shaft version (long shaft speedo gear, TJs at some point changed to a short shaft speedo gear), you should be able to take the top section off the speedo gear insert and replace it with the cable drive, or go to a auto scrap yard and get one out of an 89 or earlier NP231 or D-300.
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Unread 09-04-2009, 04:41 PM   #4
antec
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Quote:
Originally Posted by 93jeepyj View Post
You should be able to pull the electronic sending unit out of the np231 and use the old sending unit from the 207. If not mechanical sending units for the 231 are very easy to come by so you can just use your cable and speedo already in your jeep.
the 207 and 231 speedo are not the same not even close.
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Unread 09-04-2009, 06:23 PM   #5
93jeepyj
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1993 YJ Wrangler 
 
Join Date: May 2008
Location: windsor locks, CT
Posts: 2,686
Quote:
Originally Posted by antec View Post
the 207 and 231 speedo are not the same not even close.
ok still an easy fix, all he needs is a mechnical speedo gear housing from a 87-91 yj that had an np231, lots of chryslers used the same housing as well. I got one on ebay for like 13 bucks.
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