Has anyone added a tilt trim gauage to a 90's model Merc?

[CharlestonSC]

Did a bit more research
On the back of my dash there are several wires not hooked up.
I see a brown with white stripe, which must be the tilt sender.
There is a tan then a tan/w blue
The tan/w blue is tied in to the temp horn,

Also a few others I wondering about
A black/w yellow coming off the ignition switch it has a plug in snap plug end.
Then there is a purple jumper wire zip tied near the plug that goes to the tilt trim in the throttle.