I'll look through my manuals, but I don't ever recall seeing anything in mine because mine are for '99. I think the duel fuel option was only in 94-95.

 

It was actually 95-97 and only available on the 318's.
Our OP has a V10, so this is an aftermarket conversion.

 

I see.

 

Did some looking around today and found the switch for gas and lpg tucked under the dash. There is a control box with the power disconnected. I am still going to need a tank. Any ideas where to get a 50 gal or something with some range????