I am adapting the volvo/dana/sears CC for a 68 220 with twin SUs. I need a vacuum point that is relativly constant, IE not behind the throttle plates, I am going to try using the out on the balancing tube of the intake manifold. But this is neither here nor there, I would like more info as to how volvo creates constant (relativly) vacuum.
The other ? is about the sensor on the 240. The sears set up uses a coil sensing a magnet attached to the drive shaft. WHere does the early volvo system sense speed? It comes with a coil type sensor, but has very short leads.
Any and all input welcome and appreciated.
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Patrick, '68 220, '83 245, '92 Eurovan (work truck).

The pre-86 240's sensor is a tiny coil built into the speedometer - not of much use in yours. You'll most likely wind up strapping magnets on the driveshaft.

You might grab an electric vacuum pump from a later 240, giving constant vacuum up hills compared to manifold/check-valve/reservoir arrangements.
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Art Benstein near Baltimore