Incrementing a Number in a Text Field by Holding a Button

Hi All,
Just wondering... is there any way to increment a display number up or down my clicking / holding a button?
im making a project to select a fuel tank capacity and want the default to be 0.0 gallons and have the user increase the number or decrease the number by clicking and up or down arrow button... If they hold the same button that function would ideally increment faster, perhaps by multiples of ten until it reached a max / min number.
Thank you for any help... i have no idea where to begin.
Pat

if tf is your textfield and you use movieclip buttons:
btn1.change = .1;
btn1.onPress=function(){
this.onEnterFrame=editTF;
btn1.onRelease=function(){
delete this.onEnterFrame;
btn2.change = -.1;
btn2.onPress=function(){
this.onEnterFrame=editTF;
btn2.onRelease=functino(){
delete this.onEnterFrame;
function editTF(){
tf.text = this.change+Number(tf.text);

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