You could probably buy one ready made on ebay for less than the price of parts to build one. I did a search for "LCD counter" and found this one that might meet your needs.
https://www.ebay.co.uk/itm/LCD-Punc...335809?hash=item2a57f589c1:g:MDYAAOSwpDdVcpN8
Les.
https://www.ebay.co.uk/itm/LCD-Punc...335809?hash=item2a57f589c1:g:MDYAAOSwpDdVcpN8
Les.