Lifetime Supporting Member
Join Date: Dec 2009
Feedback Score: 0 reviews
You're right - since it is reading your MAP sensor, it will only be as accurate as your MAP sensor is.
I have a ScanGaugeII and a ISSPRO boost gauge. They have identical values after subtracting about 14.5 off the ScanGauge for sea level pressure on the ScanGauge reading. That tells me my MAP sensor is accurate.
So the real issue is whether your MAP sensor is working correctly. Unfortunately, the only way to know that for sure is to compare it to a real boost gauge...
2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors
IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE