fuel pressure gauge is going up and down
 

ok fellas i have an 02 ext cab 4x4 dually cummins with an automatic. just got the triple pod pillar, isspro brand gauges. the gauges i have are fuel pressure, egt, boost. the problem is the fuel pressure according to the mechanical isspro gauge is when its started it steadily goes from 5 lbs to 25 lbs in gear idleing driveing wide open throttle just goes from one side to the other. now the truck idles just fine drives fine no misses nothing runs great. only mods so far are 4inch diamond eye exhaust and a 95 titanium series fass.let me know what u think. any hep will be appericated!!!!

so i RE BLEED the air out of the fuel line. no change still erradic. so i tried adding a ground wire to the ground off the sending unit. and still no change fluctuating from 4 ponds then flies back to 30 just back and forth.. im stumped. maybe i will call the vendor tomorrow...

so if anyone was or is interested, called the vendor. no help what so ever! then called manufactuer lotta help there. have to put a "needle" valve inline dam near close it because the sensor is too sensitive. i woulda known that i would have used a completly mechanical gauge. had i known the isspro was all electrical i would not have made the purchase!!!:dang:

Yup... I have the ISS pro gauge too, even with the tork-tek snubber on the VP it still bounces around alot. Mechanical gauge is the way to go

Isspro makes mechanical guages too. you just bought the wrong guage. There is lots of problems with the electric ones.

my isspro fuel pressure is an ev2 and mine works great holds solid but i do have an airdog so that might change things

Make sure you are grounded to bare metal (scrape paint if you need to)