Jim,
I've fitted a Navman fuel flow meter on my 2004 245. I originally wanted to fit the 2" display where the blank gauge is on the LHS of the dash, but the Navman gauge is too deep and it would have neant a lot of glassfibre cutting to fit it (I have since fitted a Xintex petrol detector gauge there, which is not as deep). I eventually fitted the Navman gauge on the LHS of the lower dash, that about the height of the stereo control unit on the RHS.
Since then I have fitted Navman Chartplotter, which can also display fuel data, so the 2" gauge is now unused. FYI, the senders for use with a plotter have a different connector plug to the sender used with the 2" gauge, but an adaptor cable is available. On an earlier 245, which would have had the same dash as my 1999 225 (VDO instrument pack), it would be necessary I guess to fit the gauge on a horizontal surface.
In the engine compartment, I disconnected the fuel hose from the inlet side of the fuel pump/ filter pack on the engine and fitted that hose to an extra fuel filter ( as recommended by Navman). Then, a hose from the extra filter to the sender (which is vertically mounted), and a hose from the sender to the fuel pump pack. I recommend the cable from the sender be well attached to the hose with cable ties very close to where it exits the sender, as it's easy to damage the cable where it comes out of the sender if you're struggling to change the impellor on a FWC engine!( the potting compound is very brittle and extends into the cable, so it can snap off!). I've attached the sender and extra filter to the horizontal surface just below the back of the battery selector switch box.
I was amazed how much trim, trim tab position and speed affect fuel consumption: to a certain point, higher speed give higher gph but greater MPG!).
Regards,
Graham
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