I have finished the Two Versions of the switch panel. One with the Digital Display
for my PSI Gauge and the other without. The ZIP file includes DXF format 3D CAD files
and STL format files for 3D Printing.
The Picture in the truck shows what it will look like. That one was printed with ABS like
Gray Resin on my Anycubic Photon Mono X resin Printer. It still needed some minor
adjustments for size and the Screw. The panel uses a 6-32 x 1 3/4" Flat Head Screw.
Two mods to the Overhead Console are a hole to bring the Wiring into the Console.
I suggest using a Male/Female connector Outside of the console for easy removal if
Needed. The other Mod is to pull the little Rubber Bumper out of the console. Put
some JB Weld on the top of the hole. Drill and Tap for a 6-32 Screw. The Plastic is very
thin there for Threads.
I am going to order some Black ABS Resin to print it in. The Resin takes Paint very well
from what I have been told.
Test Fit in My Laramie
Close up on the Desk
Hole for Wires
JBweld in Bumper Hole. Drill and Tap for #6-32 x 1 3/4 " Flat Head Machine Screw.
Panel Meter from Ailexpress. These come in a bunch of colors. It took three tries to get exactly what I wanted. I wanted the first digit to blank out.
I de-soldered the Decimal Pin so it doesn't light up at all. IE when the yellow wire senses 3.0V it will display _30 instead of 3.00 or _3.0. 3 volts would
be the equivalent of 30 PSI in my tanks and 20V would display 200 for 200 PSI. 5V power and 2-100V sense.
DC to DC Boost PCB from Aliexpress. It will take the Nominal 12V and boost it up to 31 Volts. Use the Pot to set the output.
My Pressure Gauge PCB. LM7805 for regulated 5V out, LM 358 Dual Op Amp, 1n4007 Diode, 10K resistor, 56.2K resistor, 5K Pot.
This is sized to fit to the Back of the Boost PCB.
12V in goes to the LM7805. The 5V output powers the Display and the Sensor. The output of the sensor goes to the 1n4007
Diode for the Voltage drop. The Sensor signal now goes from 0 to 4 Volts ( 0 to 300 PSI) to the OpAmp. The OpAMP Multiplies
the Signal through the two resistors and Pot so the Voltage reading to the Display is 3-30 Volts. The Display would Show
30 to 300 PSI. My system has a max pressure of 235psi before a safety valve releases.
300 PSI Pressure Sensor from ALIEXPRESS. I took the connector apart and replaced the short Pigtail wires with longer ones.
Sensor needs 5 Volts in and outputs 0.5 to 4.5 Volts out.
There are 5 wires to connect 12v Power and Ground, Sensor 5V power and Ground, and the Sensor Output return.