Tach Light

[Mr Roadrunner]

I have added a tachometer to the gauge cluster on my 68 Road Runner. It has a provision for a back light but the hole is completely round instead of having "notches" like the other gauges have. Anyone have any info on what I need to add this light?

 

[boss302dave]

I have added a tachometer to the gauge cluster on my 68 Road Runner. It has a provision for a back light but the hole is completely round instead of having "notches" like the other gauges have. Anyone have any info on what I need to add this light?

I did the same for my 69 Road Runner. Classic Industries has a tach harness that includes the proper light socket for this. #MB1823. $40. I does not include the bulb however. I can't remember the number of the bulb I used, but same as dome light IIRC. Good luck!

 

[Jerry Hall]

Mr Roadrunner is correct on the light socket, but I don't think the bulb for it is the same as the dome light. That bulb # should be listed in your service manual. I'm thinking it is a much smaller bulb and the socket should have a orange wire on it with a connector that will plug into a location with other orange wires in the dash harness. The socket just snaps into the round hole on the cluster. When I added a tachometer to my 67 Coronet R/T where the clock blank was I relocated the light hole and made it the exact size of the backlight hole in the clock blank.

 

[Mr Roadrunner]

Thanks for the help guys. I bought the tach and a wiring harness for it at the same time, but it did not come with a light socket, only the power wire and the lead for the tach signal. I will have to pull some receipts to figure out where I bought it from and check into the missing plug.

 

[Mr Roadrunner]

I ordered my parts from Charger Specialties, and the harness does NOT come with a light socket.

 

[Nacho-RT74]

light socket must be included on underdash harness, since you can get a delete plate or clock and STILL the car will light up that area. so must be on car harness.

 

[Billccm]

Recalling from memory, on my 68 Road Runner with factory tach the lamp plugs into a three terminal accessory socket that is built into the harness. The lamp socket is rubber and just pushes into the hole in the tach housing. The lamp wire has a male barrel termination that plugs into the accessory socket in the harness.
You will probably have this resolved soon, but I can take pictures this weekend if it will help.

 

[Nacho-RT74]

Oh! just found the delete plate doen't get light provision!!! weeeeeeird!!!!

https://www.ebay.com/itm/1968-1969-...ent-cluster-with-bezel-surround-/264244012064

tach

https://www.ebay.com/itm/1968-69-Ro...-Gauges-W-Tach-CORONET-MOPAR-68-/283379724769

Clock

https://www.forbbodiesonly.com/mopa...t-instrument-gauge-cluster-with-clock.156613/


The instrument panel diagram shows an extra wire sourced from the lighting source as mentioned... so I was wrong on the fixed provisions on dash harness like on my car which even with a delete plate got a light.

http://www.mymopar.com/downloads/1968/68BelvedereGTXSatelliteRoadRunneFull.pdf

Which must be a wire/pigtail like this:


( pic or link will be here when I find the reference )