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?

crwdns2893858:0crwdne2893858:0 crwdns2893862:0crwdne2893862:0

crwdns2894050:0crwdne2894050:0

crwdns2889612:0crwdne2889612:0 0
crwdns2892346:0crwdne2892346:0