rpm signal from vems to vems guage?

[damo_S13]

Do i still need the resister if im inputting from the vems ecu taking it from the wire going to the 200sx s13 tacho

IIRC, i did reading something on here about if you have a solid square wave with a good voltage it doesnt need the resistor?

thanks
damo

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You will need the resistor via 5v to pull the tacho line up, but shouldnt need an other resistors.

I like your thinking on this one.

[damo_S13]

thanks rob,

i will get it wired up then over the next week