On the '84, there is a speed sensor on the rear of the brake drum,
curb side. They go bad, and are only around $35. On some '84s there
is another one on the left brake drum, the cruise-control was
separated for interference reasons. The speed sensor if original is
likly to break when you attempt to free it from its rusty lock-nut. I
had to replace the sensor on two of my FCs
On the '78 mechanical one: I replaced the speedo on my '77, used a
new electronic speedometer. You can buy the new Teleflex one if you
want (matches), or go with a new VDO programmable, about $100 I
believe. For a speed sensor I used a driveshaft pickup, four magnets
on the front of the driveshaft and a pickup coil (easily) mounted
above it. On another arrangement I used the '77 speedometer cable to
drive a cruise-control AC signal generator, also easy to find at your
local NAPA et al.
If you go VDO, you can buy the matching programmable tachometer,
forget about the problematic tach drive on the FC, and drive the
tachometer from the alternator, a fairly simple modification. buy the
tachometer with the hourmeter in it, memory tells me that the '78
didn't have an engine hourmeter. A Teleflex industrial/international
tach with hourmeter used to be available to match also (as in the
later FCs and PTs), not sure they're still available but it's what I
used in my '77.
- Jeff Miller
--- In
WanderlodgeForum@yahoogroups.com, "Gardner Yeaw"
wrote:
>
> Dale,
> My '78 has a mechanical spedometer. I got an estimate of $150 to
> $200 to fix it.
>
> Gardner
> 78FC33
>
> --- In WanderlodgeForum@yahoogroups.com, "Dale Cooper"
> wrote:
> >
> > Speedometer reads very high, then very low and sometimes seems
> > accurate, I am thinking about replacing the Speedo gage in the
dash,
> > any suggestions.
> >
> > Dale Cooper
> > 1984 35 Ft. FC, SB
> >
>