Sorry but why not do it the proper way? The results will be so, so much better compared to what you're achieving right now.
It's not a big project to remove the instrument cluster, and it's well documented on the forum.
Looks like I will be learning how to remove my Speedo gauge today. The center cap fell off the needle. Does anyone know if it just snaps back on or do I need to glue it? Doug
e9coupe.com
At the same time you can easily clean the gauges, replace the bulbs and maybe even open the gauges and get them looking brand new.
My gauges looked horrible when I started my project, they had a lot of dirt on the inside of the glass.
Here's how I opened them up and cleaned them:
I don't know if this is already documented somewhere on this forum, couldn't find anything so I thought I could share some pictures of the process. I was a bit afraid when I started but it turned out to be quite easy and not extremely time consuming, approx an hour/gauge if you already have them...
e9coupe.com
View attachment 127051View attachment 127052View attachment 127053