Interesting idea. I like it!

I would just tap into the harness right where the connector goes to the sensor. IIRC there it outputs analog voltage depending on the pressure. There should be power ground, and the output (Pretty sure). Pull apart the connector, and the pins should come out, then you can solder a wire onto the pin and stuff it back into the connector so it's nice and clean, no cutting required.

OR you could always just throw another pressure sensor in there so you know exactly what signal you're getting. I think the factory one only goes up to like 30PSI anyway, at least that's all I ever see.

 

X2 on running a secondary pressure sensor.

Less chance of effing something up....

 

Well im no electrical engineer but i was required to take basic circuits for my mechanical engineering degree. Anyway... if the data off the sensor is measured by amount of voltage allowed through then a branch in the wiring has the same voltage both ways but the current is split. So if the computer only cares about the voltage then it shouldnt screw anything up, the current will only be affected. Correct me if im wrong haha. Any recommendations for a aftermarket boost gauge?

 

If you add a light in the system, you also change the resistance and that can affect the reading of the gauge. As suggested above-- adding an additional sensor just for the lights is a much better option.

 

True, i guess better safe then sorry. Thanks all

 

So i decided that im going to tap the manifold and use a pressure sensor which will send data to an ardinio board that im going to program instead of buying a digital display for 300 bucks. Now i cant wrap my mind around this... if the egt in the manifold is lets say 1500 F or 815 C how will high will the temp resistance need to be for the pressure sensor? also how are these analog gauges using plastic tubing off the manifold?! am i missing something here?

 

You measure boost at the intake manifold...

 

Ohhhh that makes total sense haha, I kept reading manifold manifold manifold on how tos and install instructions. My mind kept jumping to exhaust manifold.
My bad Sorryz!

 

I was going "hmm this guy surely shouldn't own a diesel!" :roflmfao

 

ok back to the forum! Whats the max boost psi i would see on a stock lly and then a mild efi tune? looking for abouts, just need to know what range to buy... also does anyone know what type of sensor would work best for what im trying to do? differential, absolute, vacuum etc... im thinking absolute or dif because i only care about the turbo spool up so positive pressure not vac. MAP sensors are abs/vac fyi

 

Never saw the stock turbo go over 30 on my LBZ. Even if the sensor gets pegged at 30 it should be fine if you're just running lights of whatever off of it.

Absolute of differential shouldn't matter depending on how you're processing the data. Differential will compare the boost pressure to something else, like the ambient air pressure and show the difference. For your application the difference in ambient pressure from going up or down in altitude or weather conditions won't make a big difference so you should be fine either way.