ZEX Nos ?

[probedude]

True, but you'd then need a voltage regulator to get the +5V.

If you're going to use a relay, have the relay's coil actuated by the MSD
RPM window switch , then use the contacts of the relay in series with the
arming switch.

Though if the arming switch just switches ground to the ZEX control box,
there is no need for the window switch
(but do check the current draw requirements of the ZEX arming signal.  Might
be more than the MSD unit can handle).

Dave
> You cound use a relay in conjuction with the MSD window switch to get a
> positive voltage.