I'm looking for the 5 dash gauges/instruments for my project '73 911T. The user/owner's manual says the first 2 gauges from the left are fuel level, then oil temperature. However, I understand that combination gauges, which add oil level (on the far-left gauge) and oil pressure (on the 2nd from the left) were available on the 'S' models (and possibly an upgrade option) on the 'T' & 'E'. Can I use the combination gauges and get sending units for oil level and oil pressure? Thx!