Hi, I’m having some issues with wiring my fuel gauge.

I read a post that you wrote many years ago but I hope you will be able to help me.
I have a new gauge that I’m looking to wire in to replace an aftermarket one that my boat has. When I wire in the brp gauge, it shoots to full every time I turn on the ignition. You, I think, had a similar issue and resolved it somehow. Can you help?