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Old 09-29-2022, 07:30 PM   #1
Mini-Skoolie
 
Join Date: Apr 2022
Posts: 10
Troubleshooting Thomas gauges

Hello fellow travelers,
I have a 2007 Thomas MVP saf-T-liner with a 5.9 cummins. It has the round gauges that are daisy-chained together. Iím told that if 1 of the data wiring goes bad it will effect all gauges downstream. All the gauges in this series arenít working and Iím curious how to differentiate between if itís bad wiring, bad gauges, or bad source on the back of the circuit board. Anyone have any recommendations? Thomas quoted me $350 for the gauges! (Engine temp, oil pressure & tachometer.) Also, Iíve read that Cadillackid is using an interface for gauges and I like this idea very much. Will yíall throw any and all recommendations my way to delete this cluster and switch to a digital display? TIA
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Trailerparkjackson is offline   Reply With Quote
Old 09-29-2022, 08:36 PM   #2
Bus Nut
 
Join Date: Jun 2015
Location: Toledo OH
Posts: 490
Year: 2006
Coachwork: Thomas
Chassis: MVP-EF
Engine: Cat C7 + Allison 3000PTS
I’ve had this problem! First, get yourself a BlueFire adapter so you can set up a digital dash on a tablet or your phone. Only thing you can’t get is air pressure (which is mechanical so it should still work) and fuel level.

Then, try unplugging the gauges in the daisy chain one at a time to see if the others start working. Once it starts working the last gauge you unplugged is your bad one.
dbsoundman is offline   Reply With Quote
Old 09-29-2022, 08:38 PM   #3
Bus Nut
 
Join Date: Jun 2015
Location: Toledo OH
Posts: 490
Year: 2006
Coachwork: Thomas
Chassis: MVP-EF
Engine: Cat C7 + Allison 3000PTS
Also I bought an entire gauge cluster on eBay that might be cross compatible so if you find your bad gauge if I have it to spare I’ll sell you the one you need. The whole cluster I bought was like $300 so hopefully I can save you some money!
dbsoundman is offline   Reply With Quote
Old 10-11-2022, 05:10 PM   #4
Mini-Skoolie
 
Join Date: Apr 2022
Posts: 10
Thank you very much for the info. I used the data wires off the Speedo (that I know are good) and tried to troubleshoot each individual gauge with no success. I think it’s odd that 4 gauges (all daisy-chained off the same port) would be bad. I looked into the blue fire and may still go that route but don’t own a tablet that I could use. I found a less expensive option on Amazon called a scangauge. It isn’t pretty but it did the trick. Plugs into the j1939 and displays all the info except fuel level. My senders are all working but it did let me diagnose a sticking thermostat. My 2007 Thomas has an older style gauge and I found a newer style cluster on eBay I’m thinking about buying. Do you know of any source that talks about gauge cluster interchangeability between years?
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