tacho problem

g_root = getRootElement()
g_rootElement = getResourceRootElement( getThisResource() )
g_Player = getLocalPlayer()

c_EnableScaling = true
-- --> These values will be scaled with screen size
-- Offsets from the lower right screen corner
c_XOffset = 10
c_YOffset = 10
c_ImageW = 200
c_ImageH = 200
c_BarW = 50
c_BarH = 10
c_BarYOffset = 70
-- <--

-- All other values are fixed
c_FireTimeMs = 5000
c_BarAlpha = 120
c_BarFlashInterval = 300

g_tFireStart = nil

function drawNeedle()
if not isPedInVehicle(g_Player) then
-- Fallback for player exiting car without onClientVehicleStartExit event
-- (e.g. falling off a bike)
hideSpeedometer()
end
local vehSpeed = getVehicleSpeed()
local vehHealth = getElementHealth(getPedOccupiedVehicle(g_Player))

if vehHealth and (vehHealth > 0) then
-- Show a little red/green health bar on the speedo
local hp = (vehHealth-250)/750
local curBarLen = hp*g_BarW
if curBarLen < 1 then curBarLen = 1 end

-- green/yellow till 50%, then yellow/red
local r = 255*(1 - hp)/0.5
if r > 255 then r = 255 end
local g = 255*hp/0.5
if g > 255 then g = 255 end
if g < 0 then g = 0 end

if hp >= 0 then
g_tFireStart = nil
dxDrawRectangle(x + g_ImageW/2 - g_BarW/2, y + g_BarYOffset, curBarLen, g_BarH, tocolor(r, g, 0, c_BarAlpha))
else
-- Flash red bar for 5s when car is about to blow
if not g_tFireStart then g_tFireStart = getTickCount() end
local firePerc = (c_FireTimeMs - (getTickCount() - g_tFireStart)) / c_FireTimeMs
if firePerc < 0 then firePerc = 0 end
local a = c_BarAlpha
if (getTickCount()/c_BarFlashInterval)%2 > 1 then a = 0 end
dxDrawRectangle(x + g_ImageW/2 - g_BarW/2, y + g_BarYOffset, firePerc*g_BarW, g_BarH, tocolor(255, 0, 0, a))
end
end
-- Draw rotated needle image
-- Image is scaled exactly 1° per kmh of speed, so we can use vehSpeed directly
dxDrawImage(x, y, g_ImageW, g_ImageH, "needle.png", vehSpeed, 0, 0, white, true)
end

function showSpeedometer()
guiSetVisible(disc, true)
addEventHandler("onClientRender", g_root, drawNeedle)
end
function hideSpeedometer()
guiSetVisible( disc, false)
removeEventHandler("onClientRender", g_root, drawNeedle)
end

function getVehicleSpeed()
if isPedInVehicle(g_Player) then
local vx, vy, vz = getElementVelocity(getPedOccupiedVehicle(g_Player))
return math.sqrt(vx^2 + vy^2 + vz^2) * 161
end
return 0
end

addEventHandler("onClientVehicleEnter", g_root,
function(thePlayer)
if thePlayer == g_Player then
showSpeedometer()
end
end
)

addEventHandler("onClientVehicleStartExit", g_root,
function(thePlayer)
if thePlayer == g_Player then
hideSpeedometer()
end
end
)

function round(num)
return math.floor(num + 0.5)
end

function initGui()
if disc then
destroyElement(disc)
end
g_screenWidth, g_screenHeight = guiGetScreenSize()
local scale
if c_EnableScaling then
scale = (g_screenWidth/1152 + g_screenHeight/864)/2
else
scale = 1
end
g_XOffset = round(c_XOffset*scale)
g_YOffset = round(c_YOffset*scale)
g_ImageW = round(c_ImageW*scale)
g_ImageH = round(c_ImageH*scale)
g_BarW = round(c_BarW*scale)
g_BarH = round(c_BarH*scale)
g_BarYOffset = round(c_BarYOffset*scale)
disc = guiCreateStaticImage(g_screenWidth - g_ImageW - g_XOffset, g_screenHeight - g_ImageH - g_YOffset, g_ImageW, g_ImageH, "disc.png", false)
x, y = guiGetPosition(disc, false)
end

addEventHandler("onClientResourceStart", g_rootElement,
function ()
initGui()
guiSetVisible(disc, false)
setTimer(function()
local w, h = guiGetScreenSize()
if (w ~= g_screenWidth) or (h ~= g_screenHeight) then
initGui()
end
end, 500, 0)
if isPedInVehicle(g_Player) then
showSpeedometer()
end
end)