You may have seen the thread over in the 2nd Gen Tacomas section where I put together a little digital inclinometer for myself. It got so much interest that I decided to really polish it up and make it available for everyone!
It has an inclinometer as well as an altimeter. It also contains additional sensors I'm not using yet, but the hardware is upgradable so you'll be able to take advantage of them as they come online (the main chip is removable and can be re-programmed or simply replaced with another with updated software).
Here's a walkthrough of all the features:
You can pick one up at my shop: http://store.camerontech.io They come as a parts kit (you solder together yourself) for $100 or I can pre-assemble them for $25 more. They're also available with two different screens: 4 different colors of LCD with backlight (dimmable) and 3 different OLED screens. The OLED screens are an extra $10. Because you guys have been so supportive while I was building this thing you can use the coupon code TACOMAWORLD at checkout and get 20% off.
There is no enclosure yet but that's next on my list of things to build. It will probably be a couple of months (at least) until I've got something ready. I'm thinking either something you can velcro to the top of the dash or suction cup to the windshield.
This thing is open source meaning that the hardware designs and software are all available for free so you don't have to buy one from me: you can get all the parts and build it yourself. I'm a software developer during the day and open source is very important to me. It's based on the Arduino platform (also open source).