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Old 07-13-2021, 01:12 AM   #1
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Speedometer

Hello I have a 1993 National RV with a AT542 Transmission. It has a electronic speedometer signal. It sends a signal to gauge. It no longer works they no longer make this part. So far can't find a used one anywhere. Has anyone come across this and did you find something to replace it with. The main problem is the cruise control won't work I can GPS for my speed but would like cruise control. I can get part numbers if that would help. It's a three part system. A rod goes down into a gear on transmission the middle part counts the revolutions and converts it into a electronic signal and the top part sends to gauge. Hope that makes sense. Thanks Ed
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Old 07-13-2021, 06:30 AM   #2
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What part are you looking for? If it's not getting a signal to the speedo or cruise it's most likely the reluctor or pickup but it could be the connector or wiring.
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Old 07-13-2021, 07:45 AM   #3
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Use your GPS. It's more accurate. Jane's speedometer reads 10% fast so I always have to do mental math when checking it. The Garmin girl is quick, not fast.
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Old 07-25-2021, 06:37 PM   #4
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We had a similar problem with our older coach. I bought an aftermarket GPS speedometer / odometer. Was a simple installation. Its a more expensive unit due to its accuracy, all GPS aftermarket speedo's arent the same. If you want the exact model post and Ill retrieve the data. FYI ours works perfectly and solved our "cable from the tranny" issue.
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Old 07-26-2021, 10:41 AM   #5
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So did your cruise control work with the GPS SPEEDO
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Old 07-27-2021, 05:36 AM   #6
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Quote:
Originally Posted by Edhick View Post
So did your cruise control work with the GPS SPEEDO
Good question, and the answer is no. However, the cruise control hasn't worked on our coach since we've owned it. The speedo cable is still intact and zip tied to the frame. Getting the cruise control working is on my list. I thought the signal for that came off the speed sensor in the tranny. (the tranny just got a total rebuild) If Im wrong about where the cruise gets its signal please clue me in. I dont want to hijack your thread!!
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Old 07-28-2021, 10:40 AM   #7
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It's a 3 part system
Not sure which one of the 3 parts are out. From what I can find out it is usually the top part that sends the signal to dash. Part number GAF U 115246. Which they no longer make.
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Old 07-28-2021, 10:48 AM   #8
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I am not sure exactly how the cruise control ties into everything. But I assume it is all controlled by the speed control module coming off the transmission. I have a Allison AT 542 it is a 3 part sensor my under frame was built by Oskas?? Not sure on that spelling but none of the parts are available unless I can find a used one.
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Old 07-28-2021, 10:51 AM   #9
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Yes I do use GPS on phone for my speed but that doesn't help with the cruise control not working.
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Old 08-07-2021, 09:33 PM   #10
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What cruise control

i think you need to find out what brand of cruise control you have. My 93 Monaco is a diesel and uses a Bendix cruise control system which has been out of business for years.
If you have a gas rig you might be abale to use a Rostra Universal cruise system.
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Old 08-08-2021, 05:27 AM   #11
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https://www.mciindustrial.com/index...._id=3/prd3.htm
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Old 08-08-2021, 06:11 AM   #12
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Have you considered having the existing speedometer repaired? Might also have luck searching for a local hot rod shop and find out who they use.

Bobs Speedometer repair specializes in restoration.

Auto Tech Rescue out of Joplin MO repairs instruments.
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Old 08-08-2021, 10:58 PM   #13
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Quote:
Originally Posted by Argosy View Post
Does a sensor like this count the teeth on the flywheel on the Allison?
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Old 08-09-2021, 05:25 AM   #14
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If properly located but that's not the intended application.
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