Hall Primary Trigger - voltage limit?

[lugnuts]

Is there a high voltage limit for the Primary Trigger - Hall?

I am using a VEMS as a datalogger this weekend, and I need some kind of RPM input to start the Wideband
heating process before the start of the run.

Can the primary trigger accept 12v?
- If so, I can use the Tach output from a the CDI box.

My other choices are 8v (Autronic trigger supply - not sure what their pull-up is)

Or I must make a diode circuit to lower to 5v. (help?)

Thanks.

[GintsK]

Yes 12V should be acceptable. Signal goes trough 10kOhm resistor and then 5.1V Zener diode cuts it to safe level.

Gints

[lugnuts]

Thanks for the reply. I like it when things are easy. :)