Before I head out to buy a $300 speed sensor, and other ideas? The tachometer works, but no odometer and no tripometer.

I just dumped ver a grand into a van I had and now I'm short on $$. I'd hate to find out the speedsensor doesn't fix it. If it would, I'd fork out the $$. My hubby will install it. I'm not paying dealership labor. (OY!)