Isn't there a switch that will prevent a automatic to start unless it is in park or neutral.

You might start by looking at that, Arnie.

Arne, member lpraun, have a -73 with a 4 wire tach and you say the 3 wire came in -72?

Chris

From what i have seen so far, the four wire tach was replaced by the three wire tach in the last 240Z's which have been build (series 4, '73), the 260Z then came with the three wire tach as default.