I used to never have a pen on me.
Now I have the toolbox that goes behind the number plate and I store a very small pencil in it so I can write down the tripmeter before resetting and I also write down the speedo reading as a double check on the receipt from the fuel stop.
The I just transfer the info when im on the PC
All should need to do is clear out the text in black and put in your own.
Regards
Derek