using 12V input 0-5psi pressure transducer gives the following voltages at the bordon tube pressure gauge psi readings: 


0 psi
1.44 V
		.56
0.5psi			1.22
2.0
		.6
1psi
2.6 
  		.75
1.5psi
3.35			1.4
		.65
2psi
4.0
		.75
2.5psi
4.75			1.4
		.65
3psi
5.4
			1.1
4psi
6.5
			1.7
5psi
8.2


from 0 to 4 psi ~5.1 volt difference
say pressure ~= (voltage -1.4V) X 1.4

set pressure = `echo "TZ\r\n" | sock_exchange.tcl 192.168.4.154 80 4 "\r\n" 1 | awk '{ print ($2 == "3")? $9 : null}' | awk 'NF > 0' | awk 'BEGIN { FS = "," } ; { print $8 }' | awk '{print ($1 -
1.5)}'`