Fitting The SPA Tach
Remove The speedo & disassemble the speedometer . When working with the
components always work on a somthing like a clean heavy towel through
out the process to keep from scratching the parts . Place aside the "O"
ring & the black metal ring . You will not reuse them.
Using a screw driver peel up the lip on the speedo bezel . Take your
time . Work it up a little at a time working round & round 'til the
speedo comes out .
Take the bezel ring & using a bench grinder, grind the wrinkled edge
back to the fold line. Work slowly taking off a little at a time .
Next look at the housing & you will see a line or mark from where it
fitted into the bezel . I used straight cut aviation snips to trim the
housing at the mark . This will leave a small amount of the cut out for
the trip meter knob, but it will be covered up when you put it back
together .
Now you need to get the mounting bracket to fit on the SPA tach. Mark
the bracket so you know which way is up . Look at the back of the tach &
you will see two studs & two screw heads . We are going to mount the
bracket where the two screw heads are . The studs are clocked wrong . I
left the studs in for water tightness . Grind the bracket to clear the
lower left stud until the holes on the bracket rubber pieces line up
over the screw heads . Now you will make the mounting system . I cut two
pieces of 9/32 steel tubing just a little shorter than the thickness of
the rubber mounts on the bracket . Then I cut two pieces of 7/64" rubber
vacuum line a little longer then the thickness of the rubber mounts .
Take out the screws on the back of the tach & replace them with ones
that are long enough to mount the bracket.
Here is how it goes . Steel tubing in the holes of the rubber mounts,
vacuum line pieces inside the steel tubing, screws through the rubber
line with flat washers & lock washers or blue lock tite . Tighten the
screws 'til the flat washer contacts the steel tubing .
The next step is to assemble everything . Take the bezel & cut a piece
of 3/16" od rubber tubing that will lay in the front lip of the bezel. I
found some clear tubing from a hardware store that was perfect . Cut it
so that there is very little gap at the ends . You will use a little
silicone to seal this area during final assembly. Next install the
glass. Now take the rubber ring that was on the speedo & install it on
the tach . Make sure that it is rolled back towards the rear of the tach
& it is on squarely . Using a pair of scissors trim off the outter edge
of the rubber ring 'til the tach slides into the bezel tight against the
glass & the glass is tight against the rubber tubing . Next fit the
housing & trim the area where the mounting screw was until the housing
fits as deep into the bezel as possible & the back area clears the
bracket . I used a Dremel Tool . Push hard on the housing . You want to
get as deep as you can into the bezel .You should get about a 1/8"to
3/16" penetration . Find three of the smallest screws that you can find.
I used what is called miniature machine screws and trimed the length to
fit . The heads of these screws are 1/16" across. Use the proper length
of screw to pass through the bezel, housing,& pass over or into the
rubber ring on the tach, but not touching the tach body . Clean the
glass & tach face of marks & prints . Get some help from someone . Here
is how it goes . Install the clear 3/16" od tubing into the bezel with
the gap in the down position or 6:00 position of the tach &
place a dab of silicone to seal the gap . Install the glass , the tach
with the bracket & wiring harness installed . Install the housing &
while applying good preassure down on the housing & using the proper
drill bit, drill three holes to install the screws . One on each side of
the opening where the bracket comes though & one at the 12:00 position .
Take the housing back off and redrill the holes in the bezel just
slightly larger than the screws . You want to thread into the plastic
not the bezel . Reinstall the housing and using a dab of super glue on
the heads install the three screws . The last thing is cut a piece of
rubber or what ever and super glue it on the bracket between the bracket
& housing to give it some extra suport to keep it from rocking back &
forth . The wiring is connected by connecting the red wire
of the SPA harness to the grey wire on the back of the factory tach &
connect the SPA black wire to the black wire on the back of the factory
tach . Disregard the shield ground & program or set the SPA tach to two
cyls. I mounted the speed sensor with a simple "L" bracket attached to
the rear of the rear brake caliper support bracket & mounted the magnet
to the brake rotor with an epoxy glue . Set the SPA tach to one pickup &
remember that the sensor is polarized .
This is just a road map to show you how I did it . I'm sure there are
different ways to do this . There is another way to mount the tach buy
using the original white plastic housing & rerolling the bezel back on .
It is easier but it leaves the hole in the housing where the odometer
knob was . IMHO my way is much more work but a cleaner install & more
water resistant . Have fun and enjoy .
Eric H.
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