converting MES to a pid

I will how is the best way to semalate a load in the smoker. I have an Igrill that is dead on. Thanks for ur help

got my pid on my mes it worked good for a while thenthe temps started  droping  went fron 230 to 175 never got it to heat up again   pid is hooked stright to the heating element  pid says it heating but its not    this mes one that masterbuilt replaced because it workedsome timesit didnt so i dont know if i can get parts or not but dont know what could be wrong ith it any way i would have bet money a pid would have fixed it   oh well ill try again 

ok did a tem hook upon my mes with the pid. just wanted to see if it was going to work. well it got hot for about an hour then it stopped heating  i by passed all of the masterbuilt wiring and controls so i checked to see if i was getting power to the element and i was  checked the heating element it tested bad   i was not sure if master built would would sell me a new element because this unit never worked out of the box hadto cut the power cord and take off all the ID tags and send in pics showing all this has been done   when i called them all they ask for was the modal no. it was no problem to order it it cost 19.99   its on the way it will be in 3 to 5 days witch will work out because its going to be in the 70's next week so i will be able to work on it  sould have everything rewired the right way and buttoned up by super boil weekend   i just wanted to post so if anyone was watching this thread they woulnt think i forgot about them   cant wait to get it up and going  ive been wanting a bigger smoker as i am using a 30 inch MES right now