Dash turn signal and oil pressure light flicker

Hello All, I installed a Grant 870 steering wheel with mounting kit on my automatic column shift 1974 plymouth duster. Everything looks good and the horn works. However, when I hit the horn both turn signal indicator and oil pressure idiot light flicker on. Never had this issue before. Any idea why this would start occurring now? Didn't want to pull the wheel again if I don't have to.
v/r
Ron