https://www.auberins.com/index.php?main_page=index&cPath=5
These are the best gauges ever made, originally designed for commercial food and prcosses equipment, all gauges are exactly the same (same model just different color)
The part you want is the absolute PSI boost pickup, EGT probe, oil PSI transducer and so on.
Next time you drive, put the brake pedal down while you hold down your speed with the accelerator. The ECU will "defuel" into a low fuel map, it’s a safety thing.
These gauges have a relay built in to them. You set the parameters you want, and run an alarm, led, whatever you want.
I have done some crazy stuff with these like controlling water injections based on PSI, and get temps
I also have the relay on the EGT set to trigger at 1580 on and off at 1420 and I have the wire from the brake switch under the brake pedal wired into the relay.
SO if my egt's go off the charts, at 1420 the water injection will start pre turbo, at 1520 the 2nd stage of water injection starts POST turbo right before the manifold air temp sensor. The 3rd stage is at 1550, that’s when an additional fogger kicks in that adds a light fog into the 4 ports on my pd150 intake with water meth blend 85% water.
if for some reason and it does happen, that the EGT's reach 1580 then the ecu will think that the brake is applied even though I have my foot down on the accelerator and defaults to a defuel mode.
I have found that with my gt2052, 764's and my ghetto set up that those numbers seem to be the most reliable but I have been messing with different injection pressures and orifice sizes. I never got the system working to where I felt that it was good enough for someone else to install it and my turbo blew up for other but related reasons and is now on the shelf for my 944 swap. so I never finished it but I was able to keep the egt's at bay very well and incase anything like OIL psi, lack of boot, boost spikes, EGT issues and even coolant temps all triggered this defuel mod, all done 100% with these gauges, very easily.
I’m sure you could do it with a raspberry pi now days but once I got into gauges and found these guys, I’m sold. Also they have EPIC customer service.