Apex’i and greddy are grouped together in my mind. While they work, you have individual control boxes for both making the wiring a mess and making for potential wiring problems in the future. Most Apex’i and Greddy gauges are only availablt in Metric…I live in america…I want to see PSI not BAR and convert in my head.
Like I said to a lesser extent stewart warner is not as bad but they can be off as well. I have replaced 4 stewart warner boost gauges due to faulty readings. Some just aren’t calibrated properly out of the box or the fact is loose. Either way makes for inaccurate readings. The stewart warner EGTs aren’t even worth it. They don’t come with a probe or wiring so you need to buy those extra when all is said and done it costs you around 175 for an EGT that isn’t as nice as a Defi which is maybe $20 more.