tapping into existing data sources
Posted: Tue Jan 13, 2015 4:56 pm
Can this circuit be used in parallel with an existing gauge input, like a gas gauge or oil pressure gauge? My 1986 car has no OBD to tie into.
brentp wrote:Hi,
We're thinking that perhaps the 12v signal is causing a problem with the input circuitry and we would need to limit it to 0-5v. Would you be able to do a test with a resistor and a zener diode to limit the voltage going into the RPM input and tryting again?
The circuit would look like this:
also described in this image: http://www.reuk.co.uk/Zener-Diode-Voltage-Regulator.htmCode: Select all
-----/\/\/\/\/\------X-------------RCP Input 1K resistor | | ----- / \ 5v zener diode ----- | | | GROUND
Let us know if you'd be comfortable trying this out.