water temp gauge w/ coolant temp sensor...

[black240sx96]

well i did a search and it didnt give me the answer i was looking for....so here goes...my engine temp gauge on my cluster is completely f-ed because the needle came out and wont set back in the right possition...so i bought an autometer water temp gauge...it is currently connected to the top water hose with the sensor...no mattter what it always reads 150F....now i dont think that is completely accurate so is there a way i can connect this autometer gauge to take the place of my broken temp gauge??? do i have to tap ito the coolant temp sensor or to the broken gauge or the ecu or is this even possible and if so what is the engine temp supposed to be and when will it be over heating since it will no longer be the usual needle in the middle of the gauge and anything above that is over heating...now its numbers...thank you for your time...as you can see i have a lot of time on my hands and im tring to get my car running to the best of its ability....

[black240sx96]

anyone ??

[black240sx96]

no one knows ???