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"... as you may know these fail due to capacitor leakage."
Yes, I do know about this. See my thoughts in the link below.
Notes on 740/940 Volvo Speedometers
And as I mention in the above writeup, I'm not a 7/9 owner. I'm aware of the LH2.4 requirement for VSS in determining idle speed circumstance (e.g. is it in your driveway warming up, or are you at the toll plaza on the highway) as it exists in 240s with their VDO speedometers as well. Why? This is how Bosch designed it.
It frustrates those who modify their cars with rear axles that don't provide the signal, so it does come up a lot on the forums where aftermarket and drivetrain mods are discussed. Some live with it, and others are hungry to fix it. If I owned a 940 for which I could absolutely not fix the Yazaki instrumentation, I'd find a VDO circuit board and hide it behind the aftermarket replacement, run it in parallel from the VSS sender, and pipe its output to the LH2.4 VSS pin. Its an idea anyway. I doubt ignoring the trouble could hurt anything, but I don't know that for sure.
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Art Benstein near Baltimore
Change is inevitable, except from a vending machine.
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