How do I set the ignition timing on 94 toyota pickup?

I have a 1994 Toyota 2.4L 22RE 4Wd pickup.

I know I have to jump the 2 terminals in the diagnostic box, and I know how to use my timing light, but I am not sure of:

1. Does the engine need to be at normal operating temp during the test?
2. How do tell what the RPMs are with out a tach?
3. Is there any way to use a regular digital multimeter to read the RPMs? I heard something about having the meter on hertz, then multiply the reading by 60, but i am not sure where to put the ground electrode.

thank you.

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