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It usually mounts on the bottom edge of the dash, under the ignition switch. The harness just plugs into an accessory plug that is powered on when the ignition is on. Look for a 3-female yellow connector behind the instrument cluster or similar.
I do not know about 66 but the 67 has an eyelet end and the 68 has the bullet end for the yellow plug. I bet Midlife know all about it!