I made my own custome gauges now I need to set my tach speedo,temperature, and fuel needles so they read correctly any tips or suggestions on how to do this

I hope you marked them before you took them off or ur in trouble. But if you didnt you need to run ur car to get ur temp up and then put it where it sits, then put the tach on where it idelses, fill up the tank and put thhat one on

For my speedometer, to make sure it was right, I just had someone drive in front of me and when they were up to a certain speed, I had them signal me. hehe, it seemed to work pretty good.