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Duckling:
If you'll scroll down the board to yesterday (Wednesday) at 2:43 PM, you'll see a post from "Blue Volvo Guy" regarding his overdrive problems. The responses to his question contain information that may help you solve your OD problems. And no, running 70 mph on the freeway won't take you to redline in 3rd gear; probably no more than 3500 rpm or so, as opposed to about 2500 rpm with OD engaged. But your mileage will suffer. So, fix your overdrive.
Also WRT your tach, it takes its signal from the +1 terminal of the coil through either a white and red wire (big factory tach) or black wire (2" accessory tach). Make sure the connector is tight, clean and free of corrosion. If your tach really is broken, contact me off list; I have some spares.
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