1G 91 OFH, Are these ports usable for anything?

[Mahreeoh17]

Hi all, I have this 1991 Oil Filter Housing, will be coolant fed. These extra ports with the Allen head plugs, are they used for anything? Meaning am I able to add an aftermarket sensor or something in ports? Also what's this big dark round knob/plug for?

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[92AWDHX40]

You can put a sensor there if you want to move it around, i use one for my oil pressure sensor .

 

[Drewpy Dawg]

The "dark round knob/plug" is the oil pressure relief valve. There's a little piston and spring in there. If the pressure gets high enough to overcome the spring pressure it allows some of the pressure to bleed off.

One of the ports on the front is often used for aftermarket turbo oil feed.

 

[19Eclipse90]

Any port plugged with an Allen head could be used for an oil pressure sensor.

One of them could be used for a turbo feed, as-is.

See: 1G Oil Filter Housing Ports for Turbo oil feed