Rallye dash conversion

Hey everybody I did a rallye dash conversion from my non Rallye dash, it's a 71 duster. I purchased an oil sender and temp gauge from rock auto. So today I was testing my cluster and when I apply 12v to my cluster my oil gauge gets pegged to max, my gas gauge shows empty with theres 10 gallons in my tank. I bench tested the gauges prior and when I ground out the gauge it moves to full on all of them. Is there a specific oil sender and gas sender I need?