Crazy Tachometer

[Kevin McKeown]

Greetings from windy OC, CA,

For about the past 6 months or so, I've been having some problems with
my dash tachometer on my '86 38PT (8V92). Most of the time it reads
normally, but when it doesn't, the needle jumps all over the place, or
pegs itself at the max. I've cut the wires at the sending unit (top
of the motor just underneath the access plate under the rear bed), and
soldered and taped 'em up, but the problem still exists. Could it be
the sending unit? If so, is it a DD part or something I have to get
from Teleflex (gauge maker), or from BB? How does the sending unit
get removed? You forget how important a tach is only when it doesn't
work any longer...it's hard to hear that 8V92 all the way back there!

Thanks in advance...

Kevin McKeown
Yorba Linda, CA
1986 38' PT

[Gregory OConnor]

Kevin, when it jumps is there a pulse in the speedo? It could be
getting a signal from some other electric source. I have a like
problems with the tach and speedo and was told that it is a 'stray
signal'. I dont know how it would show up on both units unless there
is somthing that ties them together like the cruise control or
allison computer? Some times parked and with the genn running my
speedo clocks 15 mph and adds up the miles. I had the computer read
on the DD and it shows over 40,000 miles less than the dash .
Riverside speedo did not have room for the bus but told me to check
the block ground????
GregoryO'Connor
94ptRomoland --- In WanderlodgeForum@yahoogroups.com, "Kevin McKeown"
wrote:
>
> Greetings from windy OC, CA,
>
> For about the past 6 months or so, I've been having some problems
with
> my dash tachometer on my '86 38PT (8V92). Most of the time it
reads
> normally, but when it doesn't, the needle jumps all over the place,
or
> pegs itself at the max. I've cut the wires at the sending unit
(top
> of the motor just underneath the access plate under the rear bed),
and
> soldered and taped 'em up, but the problem still exists. Could it
be
> the sending unit? If so, is it a DD part or something I have to
get
> from Teleflex (gauge maker), or from BB? How does the sending unit
> get removed? You forget how important a tach is only when it
doesn't
> work any longer...it's hard to hear that 8V92 all the way back
there!
>
> Thanks in advance...
>
> Kevin McKeown
> Yorba Linda, CA
> 1986 38' PT
>