Upgrade oil temperature indicator is this possible???

Hello I wanted to ask if one of you can tell me how to install an oil temperature indicator many times someone already has experience with it. Can you do such a thing at all?? If so, where does this sensor have to measure the temperature. Have to put such an instrument holder in front of me to the A-pillar. And maybe want to make me a battery volt indicator and just the oil temperature. tschau Andre