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Old 08-29-2018, 09:30 AM   #1
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Anyone know if a scan gauge is worth the money?

Just looking to see if anyone has used a scan gauge to monitor their engine vitals such as water temp, oil temp, trans temp etc. How accurate is it? Is it worth the money? Just wondering
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Old 08-29-2018, 09:36 AM   #2
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Yes, have one on our Lexi motorhome, and 2 Subaru's
Monitor coolant temp, trans temp, mph and rpm's.
Can switch in a second to mpg, fuel used, average mpg over a period of time/miles.
MPH is very accurate, and is usually different from what your speedo is showing.
Plus, it can read error codes, and clear them if necessary.
Can be set up, depending on vehicle type/make to read numerous functions.
Well worth the $.
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Old 08-29-2018, 09:40 AM   #3
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Anytime you can keep a close watch on engine/transmission parameters is good.
I used a Silverleaf VMSpc on my two previous MH's. Present MH came with the Silverleaf 400CL unit.
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Old 08-29-2018, 09:40 AM   #4
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Quote:
Originally Posted by rudedawg1951 View Post
Just looking to see if anyone has used a scan gauge to monitor their engine vitals such as water temp, oil temp, trans temp etc. How accurate is it? Is it worth the money? Just wondering

I have a ScanGaugeD (diesel) ... works fine and is as accurate as the sensors that feed it. Worth is in the eye of the beholder ... I lucked out and got a sale at Walmart.
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Old 08-29-2018, 10:33 AM   #5
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Sure do. It sits on top of the steering post.

MPG, Water Temp, Volts, RPM. A quick glance lets me know if anything is going wrong.
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Old 08-29-2018, 10:34 AM   #6
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Thanks for the quick reply's. Where is the plug located under the dash or in the engine compartment? I looked under dash and did not see the big round kinda plug??
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Old 08-29-2018, 10:42 AM   #7
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Mine is plugged in under the dash.
Yes, really like having it right there. Much easier to monitor 4 key items in one quick glance.
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Old 08-29-2018, 10:43 AM   #8
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Thanks for the quick reply's. Where is the plug located under the dash or in the engine compartment? I looked under dash and did not see the big round kinda plug??

Depends on your RV ... what are you driving?


My connector is on the driver side slightly above where I would rest my left foot.
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Old 08-29-2018, 10:45 AM   #9
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I don't know what chassis you have but on my Workhorse the engine temp gauge never moves off center. I bought the Scan Gauge II to monitor the real engine temps and it does the job. I also monitor MPG and avg MPG to hopefully run where I get the best MPG. It took a couple of adjustments to get it accurate but it also works quite well.
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Old 08-29-2018, 10:54 AM   #10
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Old 08-29-2018, 09:40 PM   #11
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rudedawg1951

Here's where they located it on my 7372 Tradewinds built in February 1999.


This is the side panel left of the driver's seat under the transmission and leveling controls. The OBD Jack is directly under the transmission selector, but up higher than can be seen through the opening here.


If you look carefully you can see a wire bundle tagged "J1587 DATA LINK." That's what you're looking for. You can follow it up to the jack.


J1587 is the data protocol that's used to communicate with the engine control module.


The metal to the left is the side wall mounting surface that the fuse blocks and other things are mounted on. The jack faces aft. My J1578 jack had a cover on it. I've talked to other Tradewinds owners who found their jack without a cover.


Finally this is the well hidden 6-Pin OBD Jack used on the Freightliner XC diesel chassis (at least my 1999). As a side note, I have another J1578 jack at the end of a loose cable on the passenger side of the engine accessible from the battery compartment.
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Old 08-29-2018, 09:45 PM   #12
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I have a Scan Gauge D on my DS and I use it to monitor things that my instrument cluster doesn't. I'll change the parameters as need be. I give it a thumbs up.
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Old 08-31-2018, 10:15 AM   #13
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Great info on the Scanguage, I was totally unfamiliar with them, but clearly see the value in one. May well be my next purchase. Question: To those using them, have you been able to find the sweet spot on MPG by using the ScanGuage? Do you find that worth the expense? thanks in advance.
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Old 08-31-2018, 12:50 PM   #14
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Great info on the Scanguage, I was totally unfamiliar with them, but clearly see the value in one. May well be my next purchase. Question: To those using them, have you been able to find the sweet spot on MPG by using the ScanGuage? Do you find that worth the expense? thanks in advance.
I knew where my "sweet spot" is. It is definitely worth the price. PPL RV in Houston has it for $139
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