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I don't know the answer, but I do know that the '80s-early 90's Ford speed controls had a little pickup unit which went behind the dash. It was used in the add-on speed controls as well as some factory units.
The speedometer cable is unplugged from the gauges and stuck into this little pickup, then a second, shorter cable is attached from the back of the pickup to the gauges.
My guess is the number of pulses is not so important--the cruise control works by counting pulses per time, and maintaining that count. If the pulses are way off, I could see it refusing to engage because it thinks the car is too slow or too fast (most systems won't engage under 25-30mph and some won't engage over 85-90).
My guess is they're pretty close.
For my Amazon, I'm going to be using an early 1980s Ford dealer add-on unit, they pop up on ebay from time to time for 35-40 bucks.
This unit has the buttons on the turn signal stalk, which goes to a metal post. This metal post can be adapted to take the place of the stalk on the 122 turn signal switch.
Then it's just a vacuum source and a hookup to the throttles on the Volvo, power, ground, and that little pickup behind the dash.
Ben
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