How to insall a megasquirt 2 system on a 1996 grand cherokee

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https://www.google.com/search?q=1996+jeep+grand+cherokee+security+reset

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Sounds like you need to have your ecu repaired. I've seen this problem on 91-98 Grand Cherokees due to components inside the ecu slowly failing, and really acting up when the weather is colder. A good indicator as to if you have this problem is if your check engine light takes a while to light up, on the dash, when you turn the ignition on, before trying to crank the engine. If the light is delayed in your jeep, you need to repair the ecu.

Might be your jeep's ecu is bad. Does the check engine light come on your dash, when you turn the ignition key to on, before cranking? If not, the ecu is bad. If the check engine light does come on, it may be the crank sensor is bad on your jeep.

Coolant Sensor send bad signal to the ECU and the engine is work with abnormal parameters. Unplug the coolant sensor and clean the pin harness, sometimes this work, If not fix the problem, you need replace this sensor. For other details about Cooling System check your Service Manual ZJ-Secc-7-Cooling-System

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Computer hookup should be the same and physically it's the same engine. Only thing I can think of to check on is the engine mounts (not sure but there may have been a change there. Also, make sure you keep the same flywheel position in relation to the crankshaft and that both flywheels are identical in every way including tooth count.

Check in the Fuse Block, the cavity 2, fuse 30 Amp c/Brkr (Section (8W Page 7)

More details about electrical system for ZJ Grand Cherokee, you can find here: ZJ-Secc-8W-Wiring-Diagrams

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This trouble is common in this models, I have one '93 ZJ and my signal Sensor Coolant Level also is ON for long time; first, try to clean the plug and reset the ECU. If the signal show again, maybe you need replace this sensor.

For more details about location and diagnotics, check this documents:
ZJ-Secc-8D-Ignition-Systems
- Page 5 Location (Coolant Temperature Sensor)
- Page 11 Diagnostics/Service Procedures
- Page 24 Removal Components

ZJ-Secc-7-Cooling-System
- Page 23 Coolant Reserve Tank (Coolant Sensor Level)

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The Coolant Sensor is inside coolant bottle; in this models is common ths message failed; clean the plug and reset your ECU alarms, if the message come on again, replace your coolant sensor. And, really, one message about a bad sensor/signal is one bad work engine.

Good luck.

petrol or diesel

I believe you are on the right track. E.C.U. or relay.