You don't have enough information for anyone to determine one way or the other.
First off, what was the compressor pressure ... 3000? If so, no problem ... you got what they give for a fill.
If the compressor gauge was 4500 psi, then you most likely have a bad mini-gauge.
Go out and use the tank and get it filled again and this time watch the fill panel gauge. If there is a difference, then get your mini-gauge replaced.
Distributing Compressor Systems since 1981
August special is 1/2 off of shipping for credit card orders or FREE SHIPPING for cash orders (cash, money order, wire transfer, check). Shipping is for Continental USA only.