tyre pressures

Hello all, been driving a 7.5 ton lorry which most days is between the 7 and 7.5 limit. What tyre pressure should be in the tyres front and rear?, im getting conflicting reports, tyres are 215/75/17.5. Is there any known charts I can download?

I’d advise whatever the manufacturer recommends surely?

Are there no stickers/plates/manuals with the vehicle?
I can’t remember off hand what the 7.5s in our company run at but I think its a little over 100.

As long as the cheap pressure checker that only registers up to 100 shows 100 our lot are happy the pressure is ok on the 7.5s

Thanks jagmaz. I’ll try for the 100. cant find any info on the net.