A Cyberdyne Ultragage boost/vacuum gauge kit (part #A213E061Y) bought on
eBay. It contains a gauge, a sender, some tubing and other supplies.
Locate the vacuum line going from the throttle body to the bypass valve.
Tap into the line (or replace the hose to keep a spare handy) and insert
Connect the sender unit and attach it into a secure spot. Tie the cable
so it doesn't dangle around.
Undo the 10 mm nut holding the fuse box. Lift the box and move it aside.
Locate the wire cluster going throught the firewall next to the clutch
cable (or the clutch line). Unwrap the tape and cut the zip tie around it.
Undo Torx T25 screws on the lower panel. Unscrew the OBD II connector.
More screws around the fuses. Finally, a 10 mm bolt at the bottom,
and the trim panel comes off.
Removing the fuze box is not absolutely necessary, but it gives you more
room to do the wiring. Three Torx T25 screws.
The rubber gaiter securing the wire cluster is found next to the clutch
Push a piece of PVC pipe between the wires and the rubber sleeve so
it comes out on the engine side.
Slide the sender unit signal wire through and remove the pipe. Zip-tie
and wrap the rubber sleeve on the engine side.
Connect a piece of wire to the ground nut under the dash. Connect another
wire to the cigarette lighter fuse for a source of switched power. It is
a good idea to have the battery disconnected prior to this.
Many 2"1/16 gauges will fit right in, but you will need to cut the plastic
inside the headlight switch socket. I decided to pop the dashboard to
attach the display from the rear. Follow
guide for dashboard removal.
Trim and crimp the wires from the sender, as well as your power and ground
Attach mating connectors to the gauge display unit.
Connect the wires, double check everything and do a test run. After
you start the car, you should see 15-16 Hg of vacuum at idle.
The headlight switch will rest inside the dashboard set to the
"headlights on" position. Saab DRLs run the headlights full on anyway, so
it won't make much difference.
Wrap the switch into something so it doesn't rattle inside the dash.
Job complete. The gauge is nicely illuminated at night.
It's clearly visible in the bright sun.
Nice and stealthy when the car is shut off.