I don't know if your 96 XJ will be pre or post facelift but on TJs there have been start issues for some when the gauges go all screwy, the problem being down to bad crank sensors. Might be worth checking the sensor resistance between the B and C or 2 and 3 terminals which should be high (over 10Kohm), and also checking the wiring. Might be worth just disconnecting first and turning on ignition to see what happens with the cluster.
Also, just a thought as I've had a problem relay recently, try swapping the fuel pump relay if you haven't done so already.
Last edited by Jonny Jeep; 28-02-2019 at 07:06 PM.
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