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"This is why it comes on...
It is due to a PSID (Pressure per Square Inch Differential)switch being triped. I see them on a few peaces of air craft suport generators and hyd. test stands I work on."
I'm sure that's how they do it, but it's not how GM does it.
"Why would they make an ECU engine rev count down when they could use a $3 switch to tell you when the filter is getting clogged."
Because they're trying to figure out when the oil is worn out, not when the filter is clogging. On a car the oil goes before the filter does. On the equipment you're talking about, it may be the other way round.
It is due to a PSID (Pressure per Square Inch Differential)switch being triped. I see them on a few peaces of air craft suport generators and hyd. test stands I work on."
I'm sure that's how they do it, but it's not how GM does it.
"Why would they make an ECU engine rev count down when they could use a $3 switch to tell you when the filter is getting clogged."
Because they're trying to figure out when the oil is worn out, not when the filter is clogging. On a car the oil goes before the filter does. On the equipment you're talking about, it may be the other way round.
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