Tac2cul

How to Install Speedhut Water/Oil/Fuel (with Schrader valve) Electrical Gauges into your 99-04 Mustang GT or could be used to install other gauge sets.

I take no responsibility for any breakage or harm to your vehicle this MAY cause.

Items needed:

1. Temp Sensor and Gauge.
2. Oil Sensor and Gauge.
3. Fuel Pressure Sensor and Gauge.
4. Plumbers Tape.
5. 1. 3/8 x 1/8 brass bushing(Lasco part #17-9243)(For Water Pressure Sensor).
6. 1. ¼ MPT to 1/8 FPT (For Oil Pressure Sensor).
7. 1. 90 Street EL/ ¼ MPT (For Oil Pressure Sensor).
8. 1. NOS Fuel Rail adapter (NOS Part#NOS16785)(For Fuel Rail Sensor).
9. 2 Gallons of Premixed Antifreeze or whatever you may want to use or reuse previous antifreeze.
10. 1 Quart of fresh oil.

Tools needed:

1. 11/16 Wrench or Socket and Ratchet(For Water plug).
2. ¼ Allen Wrench or ¼ Allen Socket(Allen socket will work wonders and is the preferred way)(For Oil Plug).
3. ½ wrench.
4. Container/Bucket(For Fluids).
5. Jack.
6. 2 Jack Stands.
7. 1 3-6 inch Wobble Extension/s (For Water Plug).
8. Rags.
9. Stereo turned on and some Patience.
10. Small Phillips screw driver.
11. Im sure I missed something.

Below I will assume you know a few things:

1. You will know how to properly raise and support your vehicle with a jack and jack stands.
2. You know what Plumbers tape is and know how to use it.
3. You can find the fittings in ANY Hardware store.
4. You know how to wire your electrical Gauges up.
5. You know how to use ANY of the tools above.

Recommendations before you start this project:

1. Let car cool overnight and start in the morning.
2. Fridge with beer and or soda.
3. Some friends to keep ya company,well ok that one is an option only
Now onto the install

This is for the Fuel Pressure Sensor



1. Open hood and properly support the hood using whatever means you seem necessary.
2. Open beer or soda.
3. Remove cap from Schrader Valve.
4. Lay a rag just below the Schrader valve incase any fuel would come out. (When I did mine I let it set overnight and all the pressure was gone when I pushed on the valve)
5. Push down on valve inside the Schrader valve using your small phillips screwdriver or whatever you can find to get in there.(watch for gas spitting out)
6. Using 11/32 deep well socket or wrench turn Schrader valve counter clockwise till valve has been removed.
7. Using NOS adapter and plumbers tape,tape the threads.
8. Install NOS Adapter turning clockwise till tight. Snug it down with 11/32 socket or wrench.
9. Run your wires as you deem necessary.



This is for the Water Pressure Sensor

1. Raise and support vehicle.
2. Drink a beer or soda.
3. Empty Radiator into bucket.
4. Remove Plug from drivers side engine block using 11/16 wrench or socket turning counter clockwise(watch for water squirting out)

5. Using Plumbers tape, tape up the threads on your 3/8 x 1/8 brass bushing.
6. Install 3/8 x 1/8 brass bushing turning clockwise till tight and snug it up using your 11/16 wrench or socket.
7. Using plumbers tape, tape up the threads of your Temperature sensor.
8. Install temp sensor into 3/8 x 1/8 brass bushing and snug it up.
9. Run wires as your deem necessary
10. Close radiator drain and fill radiator till full



This is for Oil Pressure Sensor

1. While vehicle is still up in the air open another beer or soda.
2. Using ¼ allen socket remove oil pug (careful about a ¼ cup of oil will come out).
3. Using Plumbers tape, tape up your 90EL and your other fittings for your oil pressure sensor.
4. Install your 90EL first and tighten it tight and make sure its pointing in a manner not to interfere with anything.
5. Next install your ¼ MPT to 1/8 FPT turning clockwise that you previously taped up.
6. Using your ½ wrench tighten your ¼ MPT to 1/8 FPT adapter snuggly.
7. Next install your oil pressure sensor turning clockwise that your previous taped using plumbers tape.
8. Using your 11/16 wrench turning clockwise snugly tighten your oil pressure sensor.
9. Next run your wires as you deem necessary.


Open Oil fill and put about the same amount of oil back in and then close oil cap back on.

Start car and check for leaks.
If no leaks, you're all done and open another beer and grab some food and sit back and marvel at your accomplishment

Sticky maybe?

2000GT4.6

did you figure out where to get power for the gauge lighting that will dim with the dimmer switch?

Tac2cul

yeah figured dat along time ago

blue/white wire from the dimmer switch

2000GT4.6

Where did you get the wire? Did you pull the switch out or something?

I have mine just wired into the on/off switch for the lights atm, which means no dimmer.

Tac2cul

I pulled headlight switch out and put a wire splicer on it and ran it like dat

sitnlopro99gt

nice job and thanks for the write up