After staring at my dash for several months, here is how I decided to install my Scan Gauge II.
Not one hole has to be drilled in your Tundra.
It's a real easy cable run from the OBD connector to the display unit.
You can knock this project out in under a hour.
Scan Gauge visibility is great from my seat height. All instrument cluster annunciator lights are visible.
Materials: 7 1/2 inches of 3/4" x 1/16" flat aluminum stock.
3 to 4 inches of 1" x 1/16" angle aluminum stock.
Two 1/8" aluminum pop rivets (or epoxy, 5200, or other adhesive).
Felt or plastic sticky backed pads
Velco
Tools: Hacksaw
Dremel with cutting wheel,
Vicegrips
File
Drill with 1/8" bit
Pop Riveter
Using your dremel or hacksaw, cut a 7 1/2 " length of flat aluminum stock (all measurements are approximate). Clean up the rough edges with your file as you go.
Point the drivers side A/C vent up. Slide the flat stock in the gap between the vent and the dash. On my 2000 model, There is a rib that is 3/4" above the bottom of the duct. With the vent pointed up you can slide your flat stock right into that gap beneath the rib. It should go in about 3" and not go past the vent shut off valve. (It fits like it was made to go there).
With the piece still in the vent, mark it where you want to make the bend.
Remove the piece and make a 90 degree bend.
Slide your piece back into the vent. You'll probably see that it kind of droops in relation to the instrument pod. Remove your piece and using the vice grips, put a little twist into the part that goes into the vent. Refit and check. Bend some more as necessary. About 10-15 degrees of twist should do it. DON'T TRY TO BEND IT IN THE DUCT. SOMETHING WILL BREAK.
Cut your 1" aluminum angle stock 3 to 4" in length. Take the angle piece,
3/4" flat piece, and your Scan Gauge. Dry fit them all together, marking where
you want the rivets to go, and where the notch on the back needs to be cut for the cable to plug into the Scan Gauge.
(Initially, I tried plugging into the end of the Scan Gauge but every time I adjusted the steering wheel, it bumped the SG cable & knocked the whole thing out of whack. Hence the notch).
Once everything is lined up to your satisfaction, clamp the two pieces together and drill two 1/8" holes and then rivet them together or, if using an adhesive, glue em, clamp em, and call it a day.
When the 2 parts are securely fastened together, take your handy dremel tool with cut off wheel
and cut out the notch for the rear cable plug. Fit and attach the velcro to the front face of the mount and the Scan Gauge.
(I used super industrial strength Velcro).
Stick some felt padding on the inside radius of the 90 degree bend to keep from chaffing a hole in your dash.
Run the cable up behind the lower dash panel and out the gap between the steering column and the dash.
Plug the cable in, slide the mount into the A/C vent under the rib and the and you're good to go!