chachi

i just got my gauge today and i don't know where to hook up the nylon tube to the pressure port. I don't know where the pressure port is on the car. I have a machanical oil pressure gauge. Can someone help me with this problem, walk me through it and maybe pics. Oh and i'm putting it in my AC vent and i don't know where i can hook up the wires for illumination. Can someone also tell me how i can do that. Thanks a bunch.

86HOGT

Alright, right above your oil filter should be the electric oil pressure sending unit for your stock gauge. If you're going to keep the stock gauge working than you're going to have to run some fancy piping so that oil pressure can be read off of the stock sending unit and the mechanical gauge. You're probably not going to do that so in order to gt your mech. gauge working you need to take out the sending unit with I think 7/8" inch socket, or a special sening unit socket if you have one. Then you need to take the nylon tubing with the correct fitting on it and screw that fitting into where the sedning unit was and you should be in business as long as there's no kinks or what not in the line.

For illumination, you need to figure out which wires are ground and which wire is for the light. You can tap into the headlight wiring or go directly to the headlight fuse and splice into there. For the ground, find a common ground that other ground wires go to under the dash and it's probably a bolt so just get the right sized eyelet and bolt that wire to ground.

chachi

Ok...the wires that came with it are only like 5 inch. long. I would have to hook up another wire to it so i can run it down farther, right?

86HOGT

Yep. It's up to you if you want to keep it the same color or not, for reference later.

tinman

I would also ditch the nylon tubing and use copper. The copper tubing should be at the NAPA store. Nylon tubing ever splits and its a major diaster...

roundman

I agree with tinman about the copper line and you could even go with SS braided hose to for a fancy look under the hood. you need to connect the hot wire for the light up to the same ciruit wire that supplies power to the dash lights so that the gauge lite will dim with the other lights and not come on unless the headlights are on or you will run down the battery with the light on all the time. you can use a 12 v test light to find the hot wire coming off the dimmer switch and then splice the wire to the gauge into that wire and then run the other ground wire to the bare metal on the chassis somewhere and you should be in business. BTW, you can run the pressure line for the gauge through the hole in the firewall where the speedometer cable runs so you don't have to drill another hole in the firewall.