Ok, I currently have greddy electrical boost gauge and egt gauge and have been getting mixed opinions from people. Which is better? An autometer mechanical boost gauge with the vacuum straight to the gauge, or the greddy with a sensor and a signal to the gauge?

 

You are introducing 2 variables, Elec. vs Mech. and Greddy vs AutoMeter...

...I prefer the AutoMeter Mech over the AutoMeter electrical. My mech boost gauge works perfectly, same reading as my EMS and they are not tapped from the same line.

A lot of electrical gauges from AutoMeter, like my FP gauge, do not zero themselves correctly when off...I hate that

I consider the mech gauges to be more reliable than elect.

 

I meant elec vs. mech i general, I just put those as two examples.

 

i would have to agree with eViL rotor and say that mechanical is going to be more reliable.

 

Electrical is generally easier to connect as you don't have to worry about actually bringing what you want to measure into the cabin (which in the case of fuel or oil, may have very specific regulations at the track). Mechanical gauges are generally cheaper. Both are equally accurate (usually).

 

Another comparison between mech and electrical is that almost all mech gauges are full sweep, and many electrical gauges are not. Full sweep is easier to read accurately.
The higher-grade electrical gauges are full sweep.

 

neither do the mech ones... the autometer has a big "box" where the o is and it never sits in the same spot. if they need a big box for 0 (2 or 3 psi wide) it tells you how good the gauge is