Gauges incorrect

[Powder Extreme]

Does anybody else's gauges not read correct? My tach and speedo will jump up and down a few needle widths. Also my mileage computer has never been right, says I'm gettin in the low 20's I WISH! I'm lucky to get 18. DC has replaced the trip computer and the gauge cluster, didn't help. Now they don't know what to do.

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2001 Quad Cab Dually, ETH, SLT Plus, 275 injectors, Banks Power Pack.

 

[Guest00]

The tach and speedo, noise in electical signals to the computer. Your trip computer interpolates fuel mileage from tps and other electronic inputs. with the power mods the throttle is not depressed as far so the computer is intepreting it as less fuel, even though the injectors and fueling box are delivering more fuel. There is no " flow meter " measuring fuel delivery and fuel return.

 

[Powder Extreme]

Makes sense about the trip computer, seems to get further off the more mods I do. Any guesses on the electrical noise problem? It's done it since the truck was new.

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2001 Quad Cab Dually, ETH, SLT Plus, 275 injectors, Banks Power Pack.

 

[Texasdeere]

My 2001. 5 does the same thing, the needles kind of float a little.

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Erik F.
2001, Silver, Quadcab, Longbed, SLT, 24V, Auto, 3. 54 limited slip, 2x4, Tow package, Camper package,
(Add ons) Pioneer, Husky Liners, Tint, Diamond Plate Tool Box, and Rail Guards, OEM Bedlinner, OEM 4x4 Mud Flaps, K&N, Geno's Breather Vent Catch Can.
(Wish list) 4" Exhaust, Low stall converter, Built transmission, Banks Power Pak.

 

[Scooby]

I beleive my tach does something similar- though not severe. It bounces slightly - I think it may have something to do with the fact that you are spreading only 3500 rpm across an entire 180 degree guage, so the movement of the needle appears amplified... . put it this way, if you had a tach that went up to 9000 rpm, you wouldn't notice the jumping around - it would seem more linear.

Another theory is that the computer is interpreting the data, right? So it may only "spit-out" rpms in 50 rpm intervals - or else it may only update the information it sends to the guage every 0. 5 seconds or something like that...

Is anyone buying any of this ?! #ad




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'01 2500 SLT+, QC, LWB, 4X4, 3. 54s, AT, SPA guages, Alpha Liner,DTT VB, SnugTop XV shell with BedRug, Grovers, Roadmasters... every option but running lights!

'98 DUCATI ST2 "Bombed" 944CC with Ducati Performance Carbon Fiber Exhaust, F. I. M. Chip, K&N and "modified" air box.