Wow. Thanks for the detailed response! The gauge I have is a so it doesn't specify what type of sensor it uses. I'll need to dig a big deeper.

Given that it has the same form factor and connector as all the myriad GM/Honeywell/etc automotive pressure sensors (a small sensor with a round 3-pin Metri Pack 150 connector), it's almost certainly 0-5V ratiometric.

I've run this because I like to live dangerously:

https://www.ebay.com/itm/Pressure-Tr...frcectupt=true

I learned that a walbro 255 was too much for the stock NB FPR and would rock up to 75 psi at idle and drop as PW increased. Walbro 190 didn't have this bad habit, and supported 650cc injectors just fine to 80% duty cycle.

Walbro 190 will support four 650cc injectors at ~100%DC even at 65psi of rail pressure. I'm pretty sure Rover still has one, left over from when the car was first built in 2010.

Sorry, didn't mean that was the limit of the pump, just that I can verify that it supports my fueling needs which is 650's @ 80%.

im logging fuel and oil pressure using cheap ebay 150psi sensors, works really well.

Hf-mx5t , do you happen to know the voltage on your gauges .5-4.5vdc?

Yeah. thats correct. standard Ebay cheapo sensors, but they work fine, ive also added a failsafe in the ECU to check if fuel pressure follows boostpressure

Did the sender come with a plug and pins? I just checked the ebay listing and looks like sensor only.

The ebay transducers come with pigtails, but I have found them to be unsuitable for automotive use. I have logging for many different pressures on my car, almost every one of the pigtails that came with the transducers has failed.

There are decent options available, search for 904-222, get a pigtail with at least 20AWG wire.

https://express.google.com/u/0/produ...BoCkFEQAvD_BwE

this should work for fuel also. Do you have ability for logging oil pressure ?

I log everything. I log oil pressure in 3 locations. Fuel pressure in 2. I log air pressure in 7 locations and EGP. The AEM sensors are nice, but I have had 2 of them fail on me over the years.

what's the setup in Ms3 for logging the oil and fuel ? I just got my MS3 PNP Pro for a 97. If you don't mind sharing that would be great.

I have 27 ADC channels via 3 tinyIOx modules connected to the CANBUS. MS3 has very few spare analog channels.

(I'm gonna loan this thread)

Can anyone help me? I'm having strange fuel pressure drops at track but only after 10min of hard driving. If I do one cooldown lap, pressure is back to normal.
Things I tested so far:
-New AN6 teflon fuel lines
-three (3) different fuel pumps (currently using AEM 400lph)
-three different fuel pump "intake filter socks" (currently using awesome Holley Hydramat)
-two different engines+turbos. No difference If I have 400whp or 500whp setup
-Temps looks ok. (fuel temp, coolant temp and oil temp)
-didn't find any leaks in FPR vacuum hoses

Only parts left that I haven't change is OEM fuel filter(its new) and oldschool Begi Fuel pressure reg. (UFO looking big thing). With 26psi boost pressure that I run, my fuel pressure stays around 600kpa (87psi) at the begin and after 10min in track I lost half of that pressure.....And nothing in temps change that much....

Why are you using sky high fuel pressures? Set base pressure to 43.5 psi and use properly sized injectors. With 26 pounds of boost you should see about 69.5 psi at the rail at full boost with a proper rising rate FPR. If you've already done everything else and your fuel temp is not getting out of control then replace the FPR and see what happens.

I forgot to mention that. I run E85 and my injectors are EV14 1300cc. I need that high pressure to maintain inj. duty cycles in ok levels (75%). Base pressure is 43psi

I would look into a new FPR. Is the current not a 1:1?

I think that is the right way. That old Begi FPR unit is ~15 years old now (you can change the ratio with it).
I have new Fuelab FPR already waiting for last AN fittings, I'm sure that will work better...

You didn't mention anything about wiring. Don't tell me you're running the stock fuel pump wiring and the stock fuel pump relay.