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My read-outs for fuel flow and % power have suddenly gone haywire - both readings are erroneous at extremely low values. e.g. when should read about 7 gph it may show 2 or less ans % power when leaned shows values such as 30% or less - way out. Seems this change might be coincident with having...

Appreciate your help. Will ck it out.

Had been reading a bit low compared to b-up round dial which seems accurate but now the EFIS shows aprox 30 to 40mph slow. Both round dial and EFIS connected to same pitot line which I've ckd and all look ok. Since both on same pitot and only one appears to work right I assume it is EFIS problem...