Jeremy Thanks for the response.
This car has had nothing but SYN oil since I have owned it.
The alarm system is microprocessor based. It uses a ZBasic ZX-24A processor and about 600 lines of code. Each input has to have some signal conditioning but not much. It checks Oil,Temperature, Voltage, Fuel remaining, Oxygen sensor, RPM. Other things could easly be added. It has start up delays, It saves any errors until they are cleared. It uses a 16X2 display that displays the 4 important readings and will point to an error with a flashing arrow. I use 2 p/b switches to change to other screens for error codes, etc. As long as the error remains it will flash a led and sound a beep. If it is an intermittent error, it turns off the led and buzzer. The error is stored even after the ign is turned off.
It uses all the original sensors so the original gauges have to work. Most of the code is reading the sensors and calculating the values.
I would be happy to send diagrams and code but I'm not sure I would know how to do it. The code is an 18K text file and the diagrams would have to be scanned or I could just send the files (75K) and you could install the software I used to create them (it is free). The hardest part is generating the code for the calculations, not impossible, just time consuming.
The cost is around $100 for all the parts, and a lot of time. I would be very happy to see someone come up with a printed circuit board and a parts kit, but I am just not able to that, but would be glad to help.
Let me know If you are interested in getting the information.

Paul

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84 500 SEL (307,xxx miles)