The standard products are an EDM700 for the CHTs/EGTs and there is a version with fuel flow.
For separate fuel flow instruments there is the EDM450, or ones from Shadin.
For a proper install, the fuel flow totaliser links into your GPS for a constantly updated computation of the FOB at landing.
These instruments are fairly cheap especially if bought direct from the USA, but the installation cost can be significant - get some quotes showing the anticipated labour hours.