I have a VMS 645 glass dash on a 2005 Allegro Bus. Two questions: First a minor one. The transmission mode symbol shows as a half circle showing only half of the M. The VMS manual describes this symbol as a full circle. The main point of this email deals with the VMS fuel gauge. Starting with a full tank I show one half tank (50%) after only 285 miles at 9 MPG. After 460 miles I was at 25%. On another trip the Freight Liner LCD Information Center showed a low fuel alert (10%) after traveling 482 miles after a fill up. I don't recall the VMS reading in this case. I was fairly sure I was not that low but filled in any case. 56 gallons filled it up. I'm not sure if the Freight Liner LCD is still receiving the proper info after the Glass Dash install. I never noticed any problems with the old analog fuel gauge. Our fuel tank is rated as 150 gallons. I'm guessing that even when I fill up I may not be have a full 150 gallons in the tank so I rated the tank at 140 gallons. Should I tell the VMS a number other than 150? Here's what my Fuel Tank config looks like. Size: 140 Sensor Type: 240-33 OHM Sensor Port: 3 - Fuel Tank Level: 22% Current Counts: 470 Empty Counts: 545 Full Counts: 210 Thanks for your help.

Submitted by Art on Wed, 2015-12-23 08:02

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Hello Skip First, we need to dial in which dash model is installed. You called it a VMS645--which is the current model...but when I asked Dale for some help on this he said otherwise. Could this be a VMS616? That will be important for addressing the Half-M problem. Also, we'll need the SW version its running to see if an update maybe addressed this. I believe that there's a special key-press combo that will reveal this: Hold down the to two buttons and wait a couple moments--then let up. A setup screen should appear with that SoftWare version, such as 30CD04 or 10xx03 . Could you summarize the fuel issue in 5 words? The numbers are helpful once I get an idea of what looks wrong...but I'd have to start making a table and do some guessing--just to cipher what the crux of the issue. Wrong rate...proportions...starting point/ expected endpoint? As for the 150 v 140: Yes. A tank 'rated' at 150 should be plugged in as a number that reflects the real drop-dead fill up point. Which as you know is *not* empty. Most folks plug in 140 or 145 in this case. cheers Art Renda Documentation Central, Silverleaf Electronics (888) 741-0259

Submitted by 40footbus on Sat, 2016-01-09 13:29

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Hello Art, Here are the specifics on my Glass Dash. BIOS: VMS 645/650 ecos Version 1.15 July 24, 2013 Hardware: VMS 645 Rev 3 Free Heap: 14810212 VMS Version: 11cc11 Problem: VMS indicates 1/4 tank - after traveling 460 miles from full tank. Took 54 gallons to fill. Wrong rate? Transmission mode symbol shows only a half circle and half of the M. Thanks, Skip

Submitted by bobkat on Sat, 2019-01-05 14:33

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I am trying to configure my VMS645 for use in my (new to me) 2006 Apex ID# 75547. At this point, I am not trying to replace the VMS440. I am only trying to replace the stock dash gauges. Initially it seems all is working by plugging into the J1939 port. This is how this unit was set up on my two previous coaches. Currently the Fuel gauge is not registering. I notice there are several setting for fuel sender - can you advise the proper one for my coach? I changed the engine to ISL400. What other parameters do I needs to set in the Programming section? I want to make sure all is correct and working before I start to modify the dash. If you have a data sheet showing what settings should be - that would be great. Thanks for your help.

Submitted by Art on Mon, 2019-02-04 10:15

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Hello bobkat, I'll email you the tech docs link to your AOL account. The docs will line out which sensors are used and some specs on setup. However... they're not handi-cam instructions for battery stats; more like Application Documents ('AppDocs') and some pin-outs. Let me know what this lacks and we'll pick it up there. cheers Art //