Thread: Installing boost gauge on a SHO
05-28-2008, 04:12 PM #1
Installing boost gauge on a SHO
I have been using the dynotune digital boost gauges for quite some time with no problems. This is the boost gauge i choose to use for this installation
They are extremely accurate and will read in tenths of a psi and also read engine vacuum.
You have to install the boost gauge sending unit into the intake manifold and to do this you have to drill and tap the aluminum plenum.
I used a shop vac and used suction right by the drill bit while i was drilling the hole. I could actually see the aluminum shavings being pulled into the vac nozzle while i was drilling. Maybe some tiny ones dropped down but i took the risk anyway
I also used suction from the shop vac while i was running the tap thru the hole.
The boost gauge sending unit is 1/8 NPT. You will use a 23/64 drill bit and a 1/8 NPT tap to cut the threads.
Once the hole is tapped use some teflon tape on the threads of the sending unit and screw it down into place.
05-28-2008, 04:14 PM #2
The next step was to drill the hole for the gauge itself. This is the location that i choose.
I also siliconed the gauge face and back to waterproof it.
05-28-2008, 04:16 PM #3
I was able to drop the wire down thru a rubber sleeve that many of the factory wires drop thru.
Here is a pic of the back side of the gauge once installed and you can see the wire routing.
05-28-2008, 04:19 PM #4
Once you have the wire dropped down you can remove the access panel in the front storage area and pull the wires thru from the gauge and sending unit. Wire up as per the instructions that come with the boost gauge.
(white wires tie together)
(black wires tie together)
(brown wires tie together and go to switched 12v source)
(blue wires tie together and go to ground)
To connect to a switched 12V source you will find a red wire with yellow stripe in the wire harness shown in the picture below. You will connect your brown wires to this wire.
Also in the wire harness is a solid black wire. This is your ground.
05-28-2008, 04:21 PM #5
Once you start the ski the boost gauge will power up. You will notice that the engine is at vacuum while at idle. When i took this pic the boost gauge was reading 9.3 inches of vacuum.
Boost will climb as you get out on the water and RPM's increase. You will not see boost on the gauge by revving the ski on the trailer.
It will take 30 seconds or so for the boost gauge to go off after shutting down the ski.
05-28-2008, 04:25 PM #6
Nice very nice.Clean install! Couldn't have done it better myself.
05-28-2008, 04:34 PM #7
I can't wait to actually see what kind of boost this comes with from the factory.
05-28-2008, 07:05 PM #8
NICE . . .YOUR MY ROLE MODEL haha but i just need an open check book like you . . .or some more confidence in messing with something so expensive!!!
05-28-2008, 07:23 PM #9
Beautiful installation.....yeah i get nervous with the thought of cutting into my SHO....but after seeing those pics I think the gauge will be well worth it.....sweet customized look and knowledge of what that supercharger is doing at all times....very nice
just checked the website......is that thing waterproof???.........didnt say anything on the website
Last edited by Rip'nTear SHO; 05-28-2008 at 07:33 PM.
05-28-2008, 07:34 PM #10
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