This avoids the expense of providing a dedicated gauge or readout and {HEAD ~ also the need} to provide {TAIL ~ a path} through the vehicle firewall during installation of the device 
to provide
This avoids the expense of providing a dedicated gauge or readout and { HEAD ~ also the need } to provide { TAIL ~ a path } through the vehicle firewall during installation of the device
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH