12v sensor signal to 5v sensor signal for ECU | FerrariChat
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12v sensor signal to 5v sensor signal for ECU

Discussion in 'Mondial' started by DanielGA, Jun 30, 2025 at 9:27 AM.

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  1. DanielGA

    DanielGA Karting

    Mar 19, 2018
    144
    Midwest
    Full Name:
    Daniel A.
    #1 DanielGA, Jun 30, 2025 at 9:27 AM
    All,

    I am converting my Mondial/308 engine to a modern ECU.

    The oil temp + oil pressure sensor original to engine are single-wire and 12volt I presume. This means ground is the chassis and 12v signal comes from the gauge...so as the sensor varies the resistance the gauge displays different values based on the voltage from 0-12v. This is my understanding.

    The AEM ECU I am using, like most ECUs today, supports 0-5V signals. How do I connect the 12v sensor to it?

    I think the solution is a pull-down resistor circuit (two resistors in fact) so that I can still feed the gauge but also produce a 5V signal. Anybody have experience with this?
     

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