Any recommendations for an electronic fuel gauge?

[n86121]

I use the mains until there is abouot 30 min to 1 hour left - 16 gals.
I have a shadin set to warn me "low fuel" to switch to aux at 76 gals used from mains.
That assures me fuel in the mains for landing.

Then I switch to aux.

When there are about 4 gals left in each aux, i.e. 30 used out of 38,

I switch back to the mains for landing.

I assume each tank may be 4 gals low, just because...
Un-level filling, combustion heater use, whatever.

I set the totalizer to assume only 120 gallons, not 128.

It would be really nice if the aux tanks could be ported somehow into the mains....

As they did with later models.

D