Do U have an electronic ING., for your Mac 90 ? I built one and it works realy well for my Mac 90. I will be selling one like it for $ 1500.00 + postage, with a life Time Warranty (in writing). It will be set in TIME and come COMPLETE. It will take U 20 mins or less to install. And it will take 10 days or less to deliver. So, Pass the word around and get back with me, ok? Thanks.