I knew my speedometer was not correct from the beginning. 160MPH seemed just a little too optimistic to me. But still, I would assume the signal for 60MPH would be going to the CC amp even if the speedometer reads 80MPH, so it should work.

I'll PM you once I do more testing and maybe we can work something out.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
1983 300SD - Tanoshii - New Monark Nozzles, new tie rods, new front Bilstiens, P/S pump resealed, R12 A/C with upgrades.
Master's degree from SNAFU with a major in the FUBAR sciences.
Monark Nozzle Install Video - http://www.peachparts.com/shopforum/diesel-discussion/321339-monark-injector-nozzle-install-video.html?highlight=rebuild+injectors