what does this do?

[mustangmatt98]

I took the white face gauges off my cluster, this white box was on the back and it looked like it was aftermarket, but it looks like it belongs there and I disconnected the wires. So where do the wires go and what is the purpose of the white box anyway?

 

[jetjock]

Iirc that's the drive circuit for the stock boost meter.

http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=136

....it looked like it was aftermarket, but it looks like it belongs there and I disconnected the wires....

Makes sense to me...

 

[3p141592654]

Yup, boost gauge drive circuit.

 

[NashMan]

and when you hit full boost and peg the gauge a a cookie comes out of the ash tray