It'll work no problem
Just change the oil pressure sender to one like in your '85 (or pull the one from your '85) and you might have to run one wire to the back of your cluster, but other than that, it's "plug and play".

I have pics of where to run from and too (might be on that link too), I just have to find them.

Todd

1986 Pickup extracab longbed "Woody edition"
SAS - 33's, 5.29's, lockright rear.

02 IS300 SportCross - my "DD"
94 2wd v6 extracab
04 Outback Wagon- wife's/family car