Missing thermal sensors? Side effects?

What would happen if I ran the Mac witgout the top thermal sensor? I got the Mac without one and have it on order but until then what would happen?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0