texture rotation speed from wheelspeed?

I´m noob at programming and I would like to have rotating offset discs on cultivator. As this would be very hard to jbeam (and would require good hardware to run), I think best solution is animated texture. But I don´t want it to rotate always, I would like to get rotating speed from rear wheel wheelspeed (which is jbeamed).

I have tried doing a lua but it didnt work.

 

I suppose it's a series of planes arrayed?
Try making them a own mesh and using props for that.

 

That sounds like a good idea. But I still don´t know how to make them rotate at same rpm as rear wheel/drum.
--- Post updated ---
Edit:
I took beacon.lua and modified it and in works

Code:

-- This Source Code Form is subject to the terms of the bCDDL, v. 1.1.
-- If a copy of the bCDDL was not distributed with this
-- file, You can obtain one at http://beamng.com/bCDDL-1.1.txt

local M = {}

local function init()
    electrics.values.discs = 1
end


local function updateGFX(dt)
    local wheelspeed = electrics.values.wheelspeed
    electrics.values.discs = ((electrics.values.discs + (dt * wheelspeed * 320)) % 360) or 0
end

-- public interface
M.updateGFX      = updateGFX
M.onInit      = init
M.onReset     = init
return M