I have a strange issue going on with one of my gauges. I have three on my pillar, prosport volts, oil preassure, boost. My boost gauge used to work fine and now it stays pegged at vac max. I thought maybe vac line. Boost works when I blow into tube with car in accessort but as soon as car starts it pegs. Now I even disconnected the sending unit totally and the gauge only pegs when car starts, but with key in acc it stays at 0. I checked the wiring and it's all hooked up same way it always has when it worked perfectly.*

 

Strangely today my volt gauge started doing same thing: it works correctly when key is in accessory and gauges don't work when engine started. They allused to work fine.

 

I am currently running a prosport boost gauge and this happened to me about 4 months back, i just had to change the boost sender and it fixed the problem right away, i think i paid like $20 for a new one from prosport

 

im starting to doubt prosport, my oil pressure gauge stopped working about a year ago now, i believe its the sender but have yet to check it

 

None of my prosport gauges work correctly when car is running, but work fine when in accessory mode. How can that be? They used to work fine. I didn't install them previous owner did.

 

ground them all to the same place

 

maybe its because you bought cheap gauges....buy some nice Stri's or Defi's or quality autometers. not the ****ty pro comp nascar gauges

 

They already are, I just regrounded them thinking that was the issue but no luck