Thanks for input here guys - I've just dropped it at my local indy, he also suspects it's a faulty EGS module but will find out more tomorrow. I have a lot of codes coming from the EGS now
51 A7 No Message (engine speed), receiver EGS, transmitter DME-DDE
51 AD No message, receiver EGS, transmitter DSC
Also the intermittently present IKE: EGS signal line disturbed
I've seen companies offering a remanufactured and coded EGS module for these like this one
https://www.precisionecu.com/product...amming-service - which is advertised as plug and play no coding required which makes me think I can buy a remanufactured module and program myself.
I can get a new one, not coded for around $400 AUD so I'm tempted to give it a go and see what happens