Installing a Boost Gauge
To install a boost gauge you will first need to purchase one. These can be purchased from most speed shops or the Grand Prix Net Store. The type of gauge is irrelevant (except these instruction are specifically for mechanical gauges), whether or not you want to see vacuum is your choice but there really isn't a need to get anything with a range greater than 20 psi.
Most gauges come with a "kit" to install the gauge. Additionally, you may need the following (this is what I needed to complete my installation - Brian):
1) Extra vacuum line length
(I bought 10 feet of rubber 1/8" inner-diameter vacuum line
and used most of it)
2) A "T" adapter - small, 1/8" inner-diameter rubber which can be found in the "HELP!" section of most auto parts stores
3) Two small 1/8" plastic vacuum line connectors - one for connecting the "T" fitting to the rubber line you bought and one extra should you need it in an emergency; they come two to a package anyway
You will need to decide the location. A professional choice might be a Lotek Engineering A-pillar replacement gauge mount. Check out some pictures of this mount on Brian's Mod. Page. Contact Lotek for availability and pricing information.
The best place to tap into a source that will realize boost is the vacuum line running to the MAP sensor. Now where is the MAP sensor? There is a vacuum line routing diagram on the underneath side of the hood. Or look at the back of the engine with the cover off. The line runs from just under the nose drive assembly as shown below (click picture for a larger view):
Install a "T" into this line as shown below (click picture for larger view):
and route into the cabin. There is a wire harness that runs through the firewall just above the passengers footwell. This is an easy location to use, but if you use rubber vacuum hose to reach that far you may have a few problems. Keep at it (jacking the car up may help you pull it through) and you can do it!
Run the line to the boost gauge and supply a switched power source for the backlight. Another document is available that describes how to light up your gauges easily so that they dim and light only when the dash lights are on.
Questions? Ask Steve Calbert (email@example.com)