Can you use pen ink for a tattoo instead of tattoo ink?

Yes, you could. if you want to die

it is done with drawing ink . and if you use home made crapyour stupid professional tools are cheap these days ,

I did that when i was younger on my ankle. Used a bic pen and a #11 sewing needle to put a smilie face on my ankle. Would I recommend it? No. Pen ink is toxic. And in a few years it will blot and look something similar to a smudge. If your damned and determined to put a tattoo on yourself with a needle and ink, look online for ink shots. It's a little tube of tattoo ink. They are a bit expensive for the quantity of ink. My other suggestion is to wait until your 18 and have an artist put the work on you. Think twice before you put a bf or gfs name or initials on you please.