You need a speedometer gear clip. CJ  Pony # C1DZ17292A. It is 3.99 and in stock.

This is from Autozone website.  It was $10.49 per can.  So far I have used three.


Features & Benefits3M™ Professional Grade Rubberized Undercoating is an easy to use black protective coating that does not run when applied, provides anti corrosive protection, sound deadening and insulation to cars, trucks and recreational vehicles. Use on vehicle underbodies, wheel wells, trunks and boat trailers.Water and salt spray resistant
Deadens sound
Aerosol can
Works great on gutters and tree wounds (I wonder if it can repair BASHed mailboxes?)

Part Number: 3584
Weight: 1.3 lbs
Application Type: Spray
Color / Finish: Black
Dry to Handle: 30 minutes
Dry to Re-Coat: 30 Minutes at room temperature
Dry to Touch Time: 30 minutes
Kit: No
Package Contents: 1 16 oz can of 3M™ Professional Grade Rubber Undercoating

Thanks, Steve.  I am going to take it apart this evening.  I will let you know what I find.

Blue- white wire.  It should be the wire coming straight from the fuse block.

I had the same problem with my turn signals.  I put a new turn signal switch in and everything worked fine,
To make sure it was the switch and not something else, I pulled the connection loose and with the key on, I found which pin was hot on the car side of the connection. I then used the used the  hot wire and touched each pin on the car side.  When I did, each individual signal light would flash.  Remember to be careful and to touch the hot wire to the car side of the connection and not the steering wheel side.  Once I saw that everything worked, a new signal switch was installed and everything works fine now.  It is easy to burn up the switch, especially with the voltage you were talking about.