Greddy 52mm electronic boost guage HELP!!!

[mk3 bamf]

I installed a Greddy 52mm electronic boost guage and it will not work. It is wired properly and lights up when supposed to. Upon start up guage will do a full sweep but isn't reading the manifold vacuum or positive vacuum. Is my vacuum source to weak..? Any ideas? Thanks....:1zhelp:

 

[mk3 bamf]

bump?

 

[Rennat]

pics of install? and where do you have it "t" into? bov line? FPR Line?

 

[mk3 bamf]

I have the T in line with FPR, dose it have to be with that like Greddy did?

 

[Rennat]

that source should be fine, thats what i always use, just make sure its SEALED. You dont want a boost leak on the FPR.

but isnt the greddy hooked up to a little black thing to read the boost? you said its electric... so im assuming its a full electric gauge. how wires come off the back of the greddy gauge?

 

[mk3 bamf]

The presser sensor is plug in to the gauge and the vacuum line is plunged in to the sensor. When I first start the supra the gauge dose a full sweep then gos back down to nothing.

 

[mk3 bamf]

This is the dash plug that I use to get the power leads and ground from, then I use the dimer switch for lighting lead.

Gauge lit

Censer itself

I also tried changing the ground to a bolt and still nothing.

 

[mkIIIman089]

Was your car restored/rebuilt?

 

[mk3 bamf]

I just put a 88 7MGTE in to the 89 Supra

 

[mk3 bamf]

Bump

 

[mk3 bamf]

Bump?

 

[tlo86]

whats the sending unit? see if you can test it with your mouth

 

[noah89t]

all i can think of now is make sure all the harnesses are plugged into the greddy box for the guage.

 

[mk3 bamf]

The Greddy 52mm gauges don't have a box, the power harness just plugs in to the boost gauge itself. The sending unit plugs in to the back of the gauge as well.

 

[mk3 bamf]

bump?

 

[7Mboost]

Your sure the vacuum line isn't cut anywhere? Where did you put the hose through into the engine bay? Is it protected by a gromet? Could it have gotten cut possibly? Just throwing out some ideas, hope they help.

 

[noah89t]

maybe the guage is just faulty, or the pressure sensor.

 

[mk3 bamf]

Is there a why I can test them?

 

[Rennat]

put the car in the on position or whatever turns the gauge on, then put an air compressor to the sending unit... if it doesnt read, then you have a bad sending unit. or you need to double check the hosing...

and theres no hosing that goes inside due to it being an electric gauge...