help with events

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Hi everyone. Well i was making a speedometer to my server and i have this problem im not understand much how work

resourceRoot, getRootElement(), getLocalPlayer and all those things

function showspeedo() 
        addEventHandler("onClientPreRender",root,calculateData) 
        addEventHandler("onClientRender",root,drawSpeedometer) 
end 
addEventHandler("onClientVehicleEnter", resourceRoot, showspeedo) 
  
function delspeedo() 
        removeEventHandler("onClientPreRender",root,calculateData) 
        removeEventHandler("onClientRender",root,drawSpeedometer) 
end 
addEventHandler("onClientVehicleExit", resourceRoot, delspeedo) 

the problem is.. If i enter to car, my speedometer is showed, but if another player enteer to another car, or he leave another car, my speedometer is deleted.

If someone can explainme please

thanks for yourtime

resourceRoot and root are defined

resourceRoot = getResourceRootElement(getThisResource()) 
root = getRootElement() 

[TAPL]

function showspeedo(player) 
        if player ~= localPlayer then return end 
        addEventHandler("onClientPreRender",root,calculateData) 
        addEventHandler("onClientRender",root,drawSpeedometer) 
end 
addEventHandler("onClientVehicleEnter", root, showspeedo) 
  
function delspeedo(player) 
        if player ~= localPlayer then return end 
        removeEventHandler("onClientPreRender",root,calculateData) 
        removeEventHandler("onClientRender",root,drawSpeedometer) 
end 
addEventHandler("onClientVehicleExit", root, delspeedo) 

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Working.!

Thanks man

[TAPL]

You're welcome.