Okay, for 3.07 1120 is a very common TPM. As I mentioned I easily found a junk Jaeger speedo from a sedan that was marked 1120.
Back when I was working on it I believe had initially contacted this company;
http://www.odometergears.com/products/Smiths-Jaeger/All/38
It was a while ago and I don’t remember who I talked to but I seem to recall they offered to look around their shop and scrounge up the proper gear for me. The gear you’re after is not on their website and I wish I could be more definitive on my conversation with them, but I didn’t follow through because I came across the junker 1120 speedo and managed to harvest the gear out of it. If you manage to source the 1120 gear, and you decide to try your hand at re-calibrating your own speedo, I’d be glad to assist. I have since changed the procedure to make it easier to degauss the bar magnet in the speedo.
Good luck
Anthony