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Unread 01-23-2012, 01:32 PM   #1
agood1
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V8 Conversions Speedo and Tach.

I have a 94 YJ that has been converted with a complete chevy drivetrain. 305 V8 with a 700R4 and an NP241C. I tried getting the stock Speedo and Tach to work with the Dakota Digital adapters but I just can't get them dialed in. A call to Dakota Digital also proved to be useless. So now I guess I will spend more money and remove the OEM gauges and replace them with some aftermarket ones. I know someone out there has done this and trying to find out some more info......like which gauges you used and where you bought them,,,,,etc.

Thanks

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Unread 01-23-2012, 03:04 PM   #2
scubamc
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Autometer and I think I bought them from 4 Wheelparts.
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Unread 01-23-2012, 08:04 PM   #3
czjeeper
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Before you do that...
I think the YJ speedo wants 8 ppr to run. If you already have the convertor, it should be somewhat doable to figure this out.
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Unread 01-23-2012, 08:10 PM   #4
timatoe
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I haven't replaced the speedo or tach on mine, but did replace all the other gauges with Autometers. The best prices I could find were through egauges.com Summit Racing was #2 on price.
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Unread 01-23-2012, 09:08 PM   #5
rinking
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I have the Dakota Digital speedo box on Mine and it works awsome. I got My signal from the VSS that I installed between the 4l60e and 231c. The VSS is sending a 40 pulse signal to the PCM and the Dakota box. It took some trial and error to get it right. I used My GPS to dial in the speed going down the road. My tach was a differnt story. I found a write up on greatlakes4x4.com on how to make the stock gauge work with a v8. It involves takeing the tach apart and desoldering and soldering in a differnt diode. It's ajustable also. Works pretty good.
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Unread 01-23-2012, 10:05 PM   #6
dodger889
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Silly of me to ask but why not use a stock jeep sending unit for the speedo? Wired correctly it should work all is a switch on off hall effect sensor. Now find the right gear drive might be another story in it's self.
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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Unread 01-24-2012, 07:30 AM   #7
czjeeper
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The Jeep 241 VSS "should" fit in the chevy case, right?
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Unread 01-24-2012, 08:52 AM   #8
agood1
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Thanks for all the great replies, I would like to make what I have now work and stay with the OEM gauges. The speed sensor I have is in the NP240C transfer case. I can get the convertor to send a signal to the speedo, but it is not steady, the speedo will read nothing till the jeep is moving about 20mph and then the speedo jumps to 80+mph and stays there till the jeep is about 40mph and then the speedo falls to zero.

Is there a link with a write up to convert the tach?

Thanks
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Unread 01-24-2012, 10:51 AM   #9
dodger889
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Is there a gear in the sending unit. It sounds like it is not engaged properly. They should rotate to ride on the drive gear.
http://www.drivetrain.com/images/sto...e/np241_lg.jpg
According to this diagram it show a sensor and drive gear.
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 01-24-2012, 11:02 AM   #10
agood1
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No, the sending unit is all electronic. It counts pulses. The speedo is also electronic....no cable.
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Unread 01-25-2012, 01:38 AM   #11
dodger889
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never said a cable but you look there is a gear to drive the sensor. In the tailshaft of TC. If you looked at the diagram is has item 9 ( sensor ) and 11 gear. That is for np 241-?, they are all the same weather it's gm jeep or if ford used them. The only thing they changed was the front mating surface and input shaft for the trans to match whatever manufacturer.
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 01-25-2012, 08:25 AM   #12
agood1
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No gear, it is a hall effect sensor. The gear you are looking at is actually a slotted wheel that spins and passes by the sensor, thus creating pulses.

I am getting pulses from the sensor, but converting them to what the Jeep speedometer wants to see is the problem.

That's why I was looking at just buying an aftermarket speedo that was setup to read the GM sensor.
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Unread 01-25-2012, 08:35 AM   #13
Que89YJ
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The question is why it isn't working. It should be 8 pulses coming out of the converter. Are you using the Jeeps VSS in the Tcase?
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Unread 01-25-2012, 09:12 AM   #14
agood1
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No, it is the GM sensor in the TC.
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Unread 01-25-2012, 09:23 AM   #15
agood1
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I just looked up a speed sensor for a 94 wrangler, it is will not work where the sensor is on the 241. The jeep sensor is a o-ring type with a bolt thru a flange. The GM sensor physically screws into the case.
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