[Whaler]

I like mechanical because they are more responsive and are not buffered somewhat by the need for electrical sender to convert from measured process signal to electrical signal.
Resistance in the smallest form on contacts or grounds affected by pipe sealants/teflon tape can play havoc on reliable readings.

Mechanicals also have a better looking sweep..usually more degrees of the face is gauge reading.

Mechanical lines can be a chore to connect and run in a nicer neater look as electrical are as simple as running a wire to the dash. Thats the only drawback on installation.

For isolation from the process, mechanical has the potential to let go and leak anywhere in the line or the dash. Electrical keeps the measured process where it is at and will not route it up to the gauge.

Mechanical if done right are great.

whaler

PS Mine are the Autometer cobra series...Smiths replicas but with the autometer guts