Some time ago Martin (medelec) created a project with TTGO with PZEM004T1 (very good) with the display on the TTGO, unfortunately I have lost this very usefull eksamble from my PC. I have tryed to search in forum but withouth luck. I mean it was approx. 2 years ago.
Maybe some of you have a copy you will share or maybe help with a link here in forum to find it