i fitted them today, to my shock the mileage was a tad more than mine (40,000 more

so i took them back out, and stripped the coupe dials and mine, i have fitted my odometer, but this has not cured it, i think ill have to fit my pcb if i want my mileage, but i still want the oil temperature gauge to work, i know how to wire this up with the coupe pcb, but will my pcb, with the oil level gauge, support the oil temperature gauge aswell?