On my 1981 and 1988 ABA engine swaps I used a piece of split coolant
hose with cable straps around it to help keep it from moving. And
IIRC, I added RTV between hose and body to better seal against water
ingress though I'd guess there's not a large chance of that happening.

Possible tip:

If it doesn't strain the wires, connector too much, leaving the
harness wire length "long" to ECU may allow the ECU connector to be
positioned more easily up under the rear bench seat when doing any
electrical testing with VOM between ECU connector and various items in
engine bay.

Neil.

On 4/10/20, Bruno Walser <bruno.walser@multavista.com> wrote:

>..... I also pulled out the grommet on the firewall
> where the wire harness goes from the ECU to the engine. .... The new ECU is located where the old one was, underneath the
> rear bench. I was not able to reuse the old grommet. .... I am still looking for a good way to close up the opening to prevent
> air-, water, mice etc from getting in?

-- 
Neil n

VE7TBN

1988 Westy 50º ABA swap: https://tinyurl.com/yap5hpwt

1981 Westy 15º ABA swap: https://tinyurl.com/y9n4xob8

VAG Gas Engine Swap Group <http://tinyurl.com/khalbay>