You can also use electronic fuel pressure guages for drive pressure. Gets rid of the 'rattle' under acceleartion and they usually ahve an electronic sending unit. Of course this takes a bit more work to set up - and i only messed with it and fittings (had lotsa help from Larry) - and then switched back to the bullydog 100 PSI boost guage.
I do now have an extra 100 PSI electronic fuel gauge so plan to go back to the electronic version as the damn clicking gets annoying sometimes during heavy acceleration (flutter of the gauge).