Boost Gauge Installation

Where do I tap the gauge into?

This has been a frequent question on the digest. I have found in my searches that the best place is the fuel pressure solenoid (FPS). Which is under the hood on the driver side of the firewall (red box). From what I've read this gives the best results from the standpoint of stability (needle doesn't vibrate) and accuracy. The hose you want to tee into is the one on the passenger side of the solenoid (green arrow). If you follow it you will see that it goes to the intake manifold. Do not tap into the hose which goes to the Fuel Pressure Regulator (Drivers Side). Besides getting inaccurate readings, you may alter the signal which gets sent to the regulator and you DO NOT want that.

How do I get the boost hose there?

Anyway you can. Seriously though, most people seem to send it through the firewall via the steering boot. Have no fear . . . you won't lose steering if you cut this boot. All you need is a small hole to fish the hose through. I placed the hole at the 9 o'clock position in the boot. I then used an unwrapped wire hanger to fish the hose through. I did this by sticking the curly end of the hanger in the hose (this holds very well) and then fishing the hanger through the boot. If you bend the hanger right and fish it through carefully the hanger should appear somewhere reachable from the top of the engine (versus crawling underneath). Then just start fishing the hose around the way you want it (without the hanger :) until it is in place at the FPS. I made sure that the hose could not rub against the steering column as I turned the wheel by keeping it taught with wire ties..

How do I tap the FPS?

I used a simple tee. To avoid cutting the hose I slipped about a 2" piece of my vinyl hose on to the FPS and then attached it to the tee. The original hose which goes to the manifold is put on the other side of the tee. I then attached the boost gauge hose to the remaining part of the tee. All of the connections were secured with wire ties to ensure they wouldn't work loose.

How do I get the gauge to light up with the dash?

First things first. Don't bother trying to make the gauge dim. You can do it fairly easily (though not as easily as you might first think:), but it will not be bright enough especially if your like me and keep your dash fairly dim. Even on the brightest setting the boost gauge is barely bright enough even for me. Therefore I will be describing how to hook the light up so that it is only on when the dash board is lit and with no dimming control.
You shouldn't worry too much about what size wire to use since the gauge doesn't really draw a lot of current, BUT, better safe then sorry. 22AWG should be more then enough. You may even want to use an inline fuse but that may be over kill since the place we are taping power from is fused itself.

1. There is a junction block that is just above your left foot above and behind the fuse box. B-66 is the wiring harness we are interested in.
2. Pull the connector from there; it is quite hard to pull that connector. I cut my hand one of the many times I pulled it out. There is a "button" on the inner side of the harness (i.e. between B-66 and B-51). You don't "have" to pull the connector but it make the following steps much easier.
3.

Now you are holding connector B-66 in your hand and asking "now what". Well find wires #2 and #14 (black and green-white respectively). Tap into those with your trusty wire taps (or splice if you really must). It doesn't matter which wire you connect to which, but I put the two black wires together and the white and green-white together.
4.

Plug the connector back in.
5. Turn on your lights and make sure your gauge and dash lights up.
6. Turn your dimmer and make sure the gauge doesn't dim but your dash does.
7. You're done. Turn your lights off and go to the next step