I want to add a oil pressure gauge to my 1997 XK8. Im going to add a T to the existing sensor. What size is the sensor? Thank You for your help. Melvin

 

Hope this is what you're looking for. It's an extract from this thread - https://www.jaguarforums.com/forum/x...pressure+gauge - that described how I fitted an oil pressure gauge alongside my sat nav

 

+1. I installed the RealGauge on my 97 so that I had functional water temp and oil pressure.

 

l almost went down the real gauge route, its a great idea. ln the end i brought a really good OBD reader for half the price. Not only does it read generic codes, but Jag ones and also gives the information on what the code means. Thats just the start, it also tells you everything from fuel maps to temp in single degrees, rpm , speed which you can record and view at a later time, basically you can read the ECU. l realized i didnt need to know the exact reading all the time. Just a thought.

 

+1with Markel, I did exactly the same. The Bluetooth OBD2 to my phone was the simplest way to get all the relevant info.

 

Real Gauge all the way if you want to retain the original looks of the interior.

 

I didn't think OBD data reported oil pressure. Am I wrong on that point?

 

You're right; it doesn't. Perhaps because there's no variable pressure sensor fitted, just the low pressure on/off switch for the warning light and the 'dummy gauge'.

There is an oil temperature sensor though.

 

There are two oil pressure PIDs on the bus for the 2001-2002 (6730-OILPRES, and 6740 OGAUGE), just not standard OBD2. This is likely true at least for 2001 and later, maybe before. Both come from the instrument panel and provide the pressure (OILPRES) and the percentage of the gauge (OGAUGE). Seeing them would need a custom PID setup to query them (query on 7EA, INST response on 7EE).

 

So so do these inform the oil gauge to set at half way or off and the warning light to turn on or off?

 

To clarify, these are mode 22 pids which are sent when requested on the CAN bus, they are not regularly transmitted unless requested. OGAUGE reports the gauge position, and the warning light is another PID (OILWL @ PID ID 22 6737, byte B, bit 5). The oil pressure switch is wired directly to the instrument cluster in the 2001-2002.