Try this
sWidth,sHeight = guiGetScreenSize()
function hudvisible ()
vehicle = getPedOccupiedVehicle(getLocalPlayer())
if ( vehicle ) then --checking
-- Gets some vehicle elements (gear, speed in MPH and KMH and health)
speedx, speedy, speedz = getElementVelocity ( vehicle )
actualspeed = (speedx^2 + speedy^2 + speedz^2)^(0.5)
kmh = math.floor(actualspeed*180) -- Kilometers per hour
mph = math.floor(actualspeed * 111.847) -- Milles per hour
mps = math.floor (actualspeed) -- Metres per second
if getElementHealth(vehicle) >= 999 then
vehiclehealth = 100
else
vehiclehealth = math.floor(getElementHealth ( vehicle )/10)
end
dxDrawText("HEALTH: #FF0000"..vehiclehealth.."%", sWidth*(1031/1280), sHeight*(646/720), sWidth*(1204/1280), sHeight*(672/720), tocolor(0, 0, 0, 255), 0.8, "bankgothic", "center", "top", false, false, true, true, false)
dxDrawText("KM/H: "..kmh, sWidth*(1031/1280), sHeight*(620/720), sWidth*(1204/1280), sHeight*(646/720), tocolor(0, 0, 0, 255), 0.8 , "bankgothic", "center", "top", false, false, true, true, false)
end
end
addEventHandler ("onClientRender", root, hudvisible )