Did a search on it, just want to make sure I understood correctly. On my 91 F350 C&C with a Sterling 10.25 I'm in the progress of ridding myself of the idiot lights on the dash and installing gauges that are actually useful and was wondering. I'd like to get a working speedo agian but the bracket or whatever you call it on my ZF5 that the speedo cable connects to on the trans is broke off (trans housing its self is fine) and I'm not sure what condition the gear inside the trans is in. I'd hate to have to pay to get the trans tore apart just to replace that little guy. Before it's mentioned I'm not going the GPS route, this is going to be a permanent fix that some methhead can't just smash & grab for a quick pawn.

I have a friend who has a spare working IIRC Autometer (universal) electric speedo he doesn't need anymore and would sell cheap. And since my truck has a VSS (which if my searches are correct even on the 91 handles ABS and should be able to send signal to a 92&up factory speedo which I also have a working spare of laying around) could I just go that route and hook it up to either of those and save myself alot of time and money screwing with the mech hookup on the trans? The speedo gauge and the other cluster are basicly free, and I could do wiring and some dash mods no problems, but pulling a trans apart is well beyond my skills and tools so I would have to pay someone else to do that and I'd like to avoid it.

Probably figured I should add, I wouldn't mind if when using the other gauge or cluster speedo if it's off a bit, thats no problem I never recalibrate anything I've lifted and put bigger tires on so don't care about that used to adding on anyway on my DDs, either way it beats the hell out of trying to watch the tach and remember the speed calcs for each gear.
Also the odometer being off isn't an issue as the truck was titled as beyond mechanical limits when the guy that had it before me bought it so no legal worries.

 

The VSS/RABS sensor should work okay to drive that Autometer speedo. It looks like it can handle a signal from 500-400,000 pulses per mile input. The rear axle mounted VSS runs in the 60,000 to 80,000 pulses per mile range depending on many factors such as the number of teeth on the exciter ring and tire diameter (revolutions per mile).

The later model trucks, 1992+, uses that same rear axle VSS signal then uses a PSOM to divide the signal down to a useable standard of 8000 pulses per mile. The Autometer speedometer does that internally as far as I can tell.

 

Excellent, glad to hear that, I figured it would work just wanted to double check. Thank you very much for the help!