I have an Auto Meter 3363 Sport-Compact Fuel Pressure Gauge on the Bullitt. Most recently the gauge had been sweeping from 20-100psi for no apparent reason and with no drivability problems, which tells me the sending unit is probably bad. Before that, at idle the gauge was fluctuating between 30-32psi so it seemed like it was on the way out anyway.
Because the gauge is at least 5 years old, the previous sending unit (#4590-0008-22 P158-5190-2) was no longer available. Auto Meter has a new and improved replacement for these 0-100psi electric full-sweep gauges, but it's not obvious when calling the mail order places. It is Auto Meter #2246 Replacement Sender (#4590-0023-12). Besides the subtle differences in the photos, the port on the new replacement is quite a bit larger than the old one. With the new sending unit, idle is rock steady at 30psi and the gauge now sweeps correctly.
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