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